SIPPING Working Group                                      Miguel Garcia
Internet Draft                                                  Ericsson
                                                         Carsten Bormann
                                                               Joerg Ott
                                                          TZI/Uni Bremen
                                                           Richard Price
                                                      Siemens/Roke Manor
                                                              Adam Roach
                                                             dynamicsoft
Expires: November 2002
                                                                May 2002


 The Session Initiation Protocol (SIP) and Session Description Protocol
      (SDP) static dictionary for Signaling Compression (SigComp)
           <draft-ietf-sipping-sigcomp-sip-dictionary-02.txt>

Status of this memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups. Note that other
   groups may also distribute working documents as Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time. It is inappropriate to use Internet-Drafts as reference
   material or cite them other than as "work in progress".

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/lid-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html

   This document is an individual submission to the IETF. Comments
   should be directed to the authors.


Abstract

   The Session Initiation Protocol (SIP) [2] is a text-based protocol
   for initiating and managing communication sessions. The protocol can
   be compressed by using Signaling Compression (SigComp) [1].
   Similarly, the Session Description Protocol (SDP) [24] is a text-
   based protocol intended for describing multimedia sessions for the
   purposes of session announcement, session invitation, and other forms
   of multimedia session initiation. This memo defines the SIP/SDP-
   specific static dictionary that SigComp may use in order to achieve
   higher efficiency. The dictionary is compression algorithm
   independent.



Garcia et al.                                                   [Page 1]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

Table of contents

   1. Introduction....................................................2
   2. Design considerations...........................................2
   3. Binary representation of the SIP/SDP dictionary.................5
   4. Security Considerations.........................................13
   5. IANA Considerations.............................................13
   6. Authors' Addresses..............................................13
   7. Acknowledgements................................................14
   8. References......................................................14
   8.1 Normative references...........................................14
   8.2 Informative references.........................................14
   Appendix A. SIP input strings to the SIP/SDP static dictionary.....17
   Appendix B. SDP input strings to the SIP/SDP static dictionary.....26
   Full Copyright Statement...........................................29

1. Introduction

   SIP [2] and SDP [1] are text-based protocols that use the UTF-8
   charset (RFC 2279 [4]). SIP and SDP were designed for rich bandwidth
   links. However, when SIP/SDP is run over narrow bandwidth links, such
   as radio interfaces or low speed serial links, the session setup time
   increases substantially, compared to an operation over a rich
   bandwidth link.

   The session setup time can decrease dramatically if the SIP/SDP
   signaling is compressed. The signaling compression mechanisms
   specified in SigComp [1] provide a multiple compression/decompression
   algorithm framework to compress and decompress text-based protocols
   such as SIP and SDP.

   When compression is used in SIP/SDP, the compression achieves its
   maximum rate once a few message exchanges have taken place. This is
   due to the fact that the first message the compressor sends to the
   decompressor is only partially compressed, as there is not a previous
   stored state to compress against. As the goal is to reduce the
   session setup time as much as possible, it seems sensible to
   investigate a mechanism to boost the compression rate from the first
   message.

   In this memo we introduce the static dictionary for SIP and SDP. The
   dictionary is to be used in conjunction with SIP, SDP and SigComp.
   The static SIP/SDP dictionary constitutes a SigComp state that can be
   referenced in the first SIP message that the compressor sends out.

2. Design considerations

   The static SIP/SDP dictionary is a collection of well-known strings
   that appear in most of the SIP and SDP messages. The dictionary is
   not a comprehensive list of reserved words, but it includes many of
   the strings that appear in SIP and SDP signaling.



Garcia et al.                                                   [Page 2]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   The static dictionary is unique and MUST be available in all SigComp
   implementations for SIP/SDP. The dictionary is not intended to evolve
   as SIP or SDP evolve. It is defined once, and stays as is forever.
   This solves the problems of updating, upgrading and finding out the
   dictionary that is supported at the remote end when several versions
   of the same dictionary coexist.

   Appendix A contains the collection of strings that SIP contributed to
   the static dictionary. The appendix includes references to the
   documents that define those strings.

   Appendix B contains the collection of strings that SDP contributed to
   the static dictionary. Again, the appendix includes references to the
   documents that define those strings.

   While these appendices are of an informative nature, Section 3 gives
   the normative binary form of the SIP/SDP dictionary. This is the
   dictionary that is included in the SigComp implementation. This
   dictionary has been formed from the collection of individual
   dictionaries given in appendices A and B.

   The two input collections are collections of UTF-8 encoded character
   strings. In order to facilitate the readability, the appendices
   describe them in one table for each collection.  In this table, each
   row represents an entry. Each entry contains the string that actually
   occurs in the dictionary, its priority (see below), its offset from
   the first octet and its length (both in hexadecimal), and one or more
   references that elucidate why this string is expected to occur in
   SIP/SDP messages.

   The columns in the tables are described as follows:

   String: represents the UTF-8 string that is inserted into the
   dictionary. Note that the quotes (") are not part of the string
   itself. Note also that the notation [CRLF] represents a Carriage
   Return character (ASCII code 0x0D) followed by a Line Feed character
   (ASCII code 0x0A).

   Pr: indicates the priority of this string within the dictionary. Some
   compression algorithms, such as DEFLATE, offer an increased
   efficiency when the most commonly used strings are located at the
   bottom of the dictionary. To facilitate generating a dictionary that
   has the most-frequently occurring strings further down at the bottom,
   we have decided to allocate a priority to each string in the
   dictionary. Priorities range from 1 until 5. A low number in the
   priority column (e.g., 1) indicate that we believe in a high
   probability of finding the string in SIP or SDP messages. A high
   number in the priority column (e.g., 5) indicates lower probability
   of finding the string in a SIP or SDP message. This is typically the
   case for less frequent error codes or optional infrequent tags.




Garcia et al.                                                   [Page 3]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   Off: indicates the hexadecimal offset of the entry with respect the
   first octet in the dictionary.  Note that several strings in the
   collections can share space in the dictionary if they exhibit
   suitable common substrings.

   Len: the length of the string (in hexadecimal).

   References: contains one or more references to the specification and
   the section within the specification where the string is defined.

   Note that the strings stored in the dictionary are case sensitive.
   (Again, the strings do not comprise the quotes ("), they are just
   shown here to increase the readability.) Where the string is a header
   field, we also included the colon ":" and the amount of white space
   expected to occur. Note that this means that not all messages that
   conform to the SIP Augmented BNF, which allows other combinations
   (e.g., a white space or horizontal tabulator before the colon (":")
   sign), will benefit as much from the dictionary -- the best increase
   in compression performance is to be expected for messages that use
   the recommended formatting guidelines for SIP.

   Some strings appear followed by an equal sign and some others do not.
   This depends on whether the string is part of a parameter name or a
   parameter value.

   In a SIP message, all the SIP headers terminate with a CRLF pair of
   characters. As these characters are appended to the end of each SIP
   header line, right after the header values, and because the header
   values are typically not part of the static SIP dictionary, we cannot
   include the terminating CRLF as part of the SIP static dictionary.
   Instead, the approach we have taken is to include in each header
   field entry the CRLF from the previous line that prefixes every
   header field. We have represented CRLF by the notation [CRLF].
   Therefore, in generating the actual binary dictionary, an entry in
   the dictionary represented as: "[CRLF]From: " has been interpreted as
   an entry whose value is CR, LF, the word From, a colon and a
   whitespace.

   SIP responses start with a status code (e.g., "302") and a reason
   phrase (e.g., "Moved Temporarily"). The status code is a normative
   part, whereas the reason phrase is not normative, it is just a
   suggested text. For instance, both "302 Moved Temporarily" and "302
   Redirect" are valid beginnings of SIP responses.

   In the SIP dictionary we have included two entries per response code,
   one including only the status code and a space (e.g. "302 ") and
   another one including both the status code and the suggested reason
   phrase (e.g., "302 Moved Temporarily"). The former can be used when
   the SIP response changed the suggested reason phrase by another one.
   The later can be used when the suggested reason phrase is part of the
   response. In this way, we accommodate both alternatives.  (Note that



Garcia et al.                                                   [Page 4]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   in the actual dictionary, both strings occupy the same space in the
   string subset, but have two separate entries in the table subset.)

3. Binary representation of the SIP/SDP dictionary

   This section contains the result of combining the SIP and the SDP
   dictionaries described in sections 3 and 4 in order to create a
   single dictionary that is loaded into SigComp as a state.

   The binary SigComp dictionary is comprised of two parts, the
   concatenation of which serves as the state value of the state item: A
   string subset, which contains all strings in the contributing
   collections as a substring (roughly ordered such that strings with
   low priority numbers occur at the end), and a table subset, which
   contains pairs of offset and length values for all the strings in the
   contributing collections.  The intention is that all compression
   algorithms will be able to use the (or part of the) string subset,
   and some compression methods, notably those that are related to the
   LZ78 family, will also use the table in order to form an initial set
   of tokens for that compression method.  The text below therefore
   gives examples for referencing both the table subset and the string
   subset of the dictionary state item.

   As defined in section 3.3.3 in the Signaling Compression
   specification [1], a SigComp state is characterized by a certain set
   of information.  For the static SIP/SDP dictionary, the information
   in the following Table 1 fully characterizes the state item.

   Note that the string subset of the dictionary can be accessed using:

      STATE-ACCESS (%ps, 6, 0, 0x0F0F, %sa, 0),

   and the table subset can be accessed using:

      STATE-ACCESS (%ps, 6, 0x0F0F, 0x0758, %sa, 0),

   where %ps points to UDVM memory containing

       0x743d3709dde9

   and %sa is the desired destination address in UDVM memory (with
   UDVM byte copying rules applied).

   Name:                    Value:
   =====================    ========================
   state_identifier         0x743d3709dde947630e70ff26b5afcb2a11bf5255
   state_length             0x1667
   state_address            0 (not relevant for the dictionary)
   state_instruction        0 (not relevant for the dictionary)
   minimum_access_length    6
   state_value              Representation of the table below.



Garcia et al.                                                   [Page 5]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   0000  766f 6963 652d 6d61 696c 0d0a 5265 6a65  voice-mail..Reje
   0010  6374 2d43 6f6e 7461 6374 3a20 0d0a 4163  ct-Contact: ..Ac
   0020  6365 7074 2d43 6f6e 7461 6374 3a20 0d0a  cept-Contact: ..
   0030  4f72 6761 6e69 7a61 7469 6f6e 3a20 0d0a  Organization: ..
   0040  4d49 4d45 2d56 6572 7369 6f6e 3a20 0d0a  MIME-Version: ..
   0050  4572 726f 722d 496e 666f 3a20 0d0a 5469  Error-Info: ..Ti
   0060  6d65 7374 616d 703a 200d 0a43 616c 6c2d  mestamp: ..Call-
   0070  496e 666f 3a20 0d0a 5265 706c 792d 546f  Info: ..Reply-To
   0080  3a20 0d0a 5375 626a 6563 743a 200d 0a57  : ..Subject: ..W
   0090  6172 6e69 6e67 3a20 3b6d 6f62 696c 6974  arning: ;mobilit
   00A0  793d 3b6c 616e 6775 6167 653d 3b70 7269  y=;language=;pri
   00B0  6f72 6974 793d 3b68 616e 646c 696e 673d  ority=;handling=
   00C0  3b66 6561 7475 7265 3d3b 7075 7270 6f73  ;feature=;purpos
   00D0  653d 3b6d 6574 686f 6473 3d3b 7363 6865  e=;methods=;sche
   00E0  6d65 3d3b 6475 706c 6578 3d3b 6d65 6469  me=;duplex=;medi
   00F0  613d 3b63 6c61 7373 3d3b 6361 7573 653d  a=;class=;cause=
   0100  3b6f 6e6c 793d 6d6f 6269 6c65 3b74 6578  ;only=mobile;tex
   0110  743d 6669 7865 6469 6d61 6765 6675 6c6c  t=fixedimagefull
   0120  6361 7264 3439 3420 5365 6375 7269 7479  card494 Security
   0130  2041 6772 6565 6d65 6e74 2052 6571 7569   Agreement Requi
   0140  7265 6465 7363 7269 7074 696f 6e6f 2d63  redescriptiono-c
   0150  616e 6365 6c34 3834 2041 6464 7265 7373  ancel484 Address
   0160  2049 6e63 6f6d 706c 6574 656c 6570 686f   Incompletelepho
   0170  6e65 2d65 7665 6e74 7334 3831 2043 616c  ne-events481 Cal
   0180  6c2f 5472 616e 7361 6374 696f 6e20 446f  l/Transaction Do
   0190  6573 204e 6f74 2045 7869 7374 616c 653d  es Not Existale=
   01A0  3430 3720 5072 6f78 7920 4175 7468 656e  407 Proxy Authen
   01B0  7469 6361 7469 6f6e 2052 6571 7569 7265  tication Require
   01C0  6469 7265 6374 3530 3020 5365 7276 6572  direct500 Server
   01D0  2049 6e74 6572 6e61 6c20 4572 726f 726f   Internal Erroro
   01E0  6275 7374 2d73 6f72 7469 6e67 3d36 3034  bust-sorting=604
   01F0  2044 6f65 7320 4e6f 7420 4578 6973 7420   Does Not Exist
   0200  416e 7977 6865 7265 6365 6976 652d 6f6e  Anywhereceive-on
   0210  6c79 3431 3420 5265 7175 6573 742d 5552  ly414 Request-UR
   0220  4920 546f 6f20 4c6f 6e67 6976 6575 7061  I Too Longiveupa
   0230  7261 6c6c 656c 3138 3120 4361 6c6c 2049  rallel181 Call I
   0240  7320 4265 696e 6720 466f 7277 6172 6465  s Being Forwarde
   0250  6465 6163 7469 7661 7465 6434 3837 2052  deactivated487 R
   0260  6571 7565 7374 2054 6572 6d69 6e61 7465  equest Terminate
   0270  6469 6765 7374 2d69 6e74 6567 7269 7479  digest-integrity
   0280  3431 3620 556e 7375 7070 6f72 7465 6420  416 Unsupported
   0290  5552 4920 5363 6865 6d65 7267 656e 6379  URI Schemergency
   02A0  3431 3520 556e 7375 7070 6f72 7465 6420  415 Unsupported
   02B0  4d65 6469 6120 5479 7065 7273 6f6e 616c  Media Typersonal
   02C0  3330 3020 4d75 6c74 6970 6c65 2043 686f  300 Multiple Cho
   02D0  6963 6573 6d69 6d65 7373 6167 6534 3838  icesmimessage488
   02E0  204e 6f74 2041 6363 6570 7461 626c 6520   Not Acceptable
   02F0  4865 7265 706c 6163 6573 3432 3320 496e  Hereplaces423 In
   0300  7465 7276 616c 2054 6f6f 2042 7269 6566  terval Too Brief
   0310  726f 6d2d 7461 670d 0a61 3d6f 7269 656e  rom-tag..a=orien
   0320  743a 6c61 6e64 7363 6170 656e 6469 6e67  t:landscapending



Garcia et al.                                                   [Page 6]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   0330  0d0a 613d 6b65 792d 6d67 6d74 3a4d 494b  ..a=key-mgmt:MIK
   0340  4559 3438 3320 546f 6f20 4d61 6e79 2048  EY483 Too Many H
   0350  6f70 7363 7470 726f 7879 4f50 5449 4f4e  opsctproxyOPTION
   0360  5320 0d0a 5265 7175 6573 742d 4469 7370  S ..Request-Disp
   0370  6f73 6974 696f 6e3a 204e 6f76 200d 0a43  osition: Nov ..C
   0380  6f6e 7465 6e74 2d44 6973 706f 7369 7469  ontent-Dispositi
   0390  6f6e 3a20 4a75 6c20 0d0a 4175 7468 656e  on: Jul ..Authen
   03A0  7469 6361 7469 6f6e 2d49 6e66 6f3a 204a  tication-Info: J
   03B0  756e 200d 0a50 726f 7879 2d41 7574 686f  un ..Proxy-Autho
   03C0  7269 7a61 7469 6f6e 3a20 5365 7020 3430  rization: Sep 40
   03D0  3320 466f 7262 6964 6465 6e6f 7265 736f  3 Forbiddenoreso
   03E0  7572 6365 3430 3820 5265 7175 6573 7420  urce408 Request
   03F0  5469 6d65 6f75 746f 6e65 3338 3020 416c  Timeoutone380 Al
   0400  7465 726e 6174 6976 6520 5365 7276 6963  ternative Servic
   0410  6535 3033 2053 6572 7669 6365 2055 6e61  e503 Service Una
   0420  7661 696c 6162 6c65 0d0a 5072 6f78 792d  vailable..Proxy-
   0430  4175 7468 656e 7469 6361 7465 3a20 4170  Authenticate: Ap
   0440  7220 3432 3120 4578 7465 6e73 696f 6e20  r 421 Extension
   0450  5265 7175 6972 6564 3430 3520 4d65 7468  Required405 Meth
   0460  6f64 204e 6f74 2041 6c6c 6f77 6564 6175  od Not Allowedau
   0470  7468 2d69 6e74 6572 6c65 6176 696e 673d  th-interleaving=
   0480  3330 3220 4d6f 7665 6420 5465 6d70 6f72  302 Moved Tempor
   0490  6172 696c 7933 3031 204d 6f76 6564 2050  arily301 Moved P
   04A0  6572 6d61 6e65 6e74 6c79 0d0a 436f 6e74  ermanently..Cont
   04B0  656e 742d 4c61 6e67 7561 6765 3a20 4665  ent-Language: Fe
   04C0  6220 0d0a 436f 6e74 656e 742d 456e 636f  b ..Content-Enco
   04D0  6469 6e67 3a20 4a61 6e20 3638 3720 4469  ding: Jan 687 Di
   04E0  616c 6f67 2054 6572 6d69 6e61 7465 6435  alog Terminated5
   04F0  3133 204d 6573 7361 6765 2054 6f6f 204c  13 Message Too L
   0500  6172 6765 0d0a 613d 6f72 6965 6e74 3a70  arge..a=orient:p
   0510  6f72 7472 6169 746f 2d74 6167 3430 3220  ortraito-tag402
   0520  5061 796d 656e 7420 5265 7175 6972 6564  Payment Required
   0530  3439 3120 5265 7175 6573 7420 5065 6e64  491 Request Pend
   0540  696e 6735 3031 204e 6f74 2049 6d70 6c65  ing501 Not Imple
   0550  6d65 6e74 6564 3430 3620 4e6f 7420 4163  mented406 Not Ac
   0560  6365 7074 6162 6c65 3439 3320 556e 6465  ceptable493 Unde
   0570  6369 7068 6572 6162 6c65 0d0a 613d 7479  cipherable..a=ty
   0580  7065 3a62 726f 6164 6361 7374 7275 6536  pe:broadcastrue6
   0590  3036 204e 6f74 2041 6363 6570 7461 626c  06 Not Acceptabl
   05A0  6534 3832 204c 6f6f 7020 4465 7465 6374  e482 Loop Detect
   05B0  6564 6d6f 6465 2d63 6861 6e67 652d 6e65  edmode-change-ne
   05C0  6967 6862 6f72 3d0d 0a6d 3d61 7070 6c69  ighbor=..m=appli
   05D0  6361 7469 6f6e 2035 3032 2042 6164 2047  cation 502 Bad G
   05E0  6174 6577 6179 0d0a 4163 6365 7074 2d45  ateway..Accept-E
   05F0  6e63 6f64 696e 673a 200d 0a41 6363 6570  ncoding: ..Accep
   0600  742d 4c61 6e67 7561 6765 3a20 0d0a 613d  t-Language: ..a=
   0610  6f72 6965 6e74 3a73 6561 7363 6170 656d  orient:seascapem
   0620  6f64 652d 6368 616e 6765 2d70 6572 696f  ode-change-perio
   0630  643d 756e 6b6e 6f77 6e6f 2d66 6f72 6b62  d=unknowno-forkb
   0640  7573 696e 6573 7369 7066 7261 670d 0a61  usinessipfrag..a
   0650  3d74 7970 653a 6d6f 6465 7261 7465 6434  =type:moderated4



Garcia et al.                                                   [Page 7]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   0660  3034 204e 6f74 2046 6f75 6e64 3330 3520  04 Not Found305
   0670  5573 6520 5072 6f78 790d 0a61 3d74 7970  Use Proxy..a=typ
   0680  653a 7265 6376 6f6e 6c79 0d0a 5072 6f78  e:recvonly..Prox
   0690  792d 5265 7175 6972 653a 2061 7474 656e  y-Require: atten
   06A0  6461 6e74 696d 656f 7574 0d0a 613d 7479  dantimeout..a=ty
   06B0  7065 3a74 6573 746c 730d 0a61 3d74 7970  pe:testls..a=typ
   06C0  653a 6d65 6574 696e 670d 0a6b 3d70 726f  e:meeting..k=pro
   06D0  6d70 743a 4d45 5353 4147 4520 0d0a 4d69  mpt:MESSAGE ..Mi
   06E0  6e2d 4578 7069 7265 733a 200d 0a52 6574  n-Expires: ..Ret
   06F0  7279 2d41 6674 6572 3a20 0d0a 556e 7375  ry-After: ..Unsu
   0700  7070 6f72 7465 643a 200d 0a49 6e2d 5265  pported: ..In-Re
   0710  706c 792d 546f 3a20 3138 3220 5175 6575  ply-To: 182 Queu
   0720  6564 0d0a 416c 6572 742d 496e 666f 3a20  ed..Alert-Info:
   0730  0d0a 613d 6672 616d 6572 6174 653a 0d0a  ..a=framerate:..
   0740  5573 6572 2d41 6765 6e74 3a20 4341 4e43  User-Agent: CANC
   0750  454c 200d 0a61 3d6d 6178 7074 696d 653a  EL ..a=maxptime:
   0760  3b72 6574 7279 2d61 6674 6572 3d34 3130  ;retry-after=410
   0770  2047 6f6e 6575 6163 6861 6e6e 656c 733d   Goneuachannels=
   0780  0d0a 5072 696f 7269 7479 3a20 0d0a 613d  ..Priority: ..a=
   0790  7175 616c 6974 793a 0d0a 6d3d 636f 6e74  quality:..m=cont
   07A0  726f 6c20 0d0a 613d 7364 706c 616e 673a  rol ..a=sdplang:
   07B0  0d0a 613d 6368 6172 7365 743a 0d0a 5265  ..a=charset:..Re
   07C0  706c 6163 6573 3a20 0d0a 5265 6665 722d  places: ..Refer-
   07D0  546f 3a20 5245 4645 5220 6970 7365 632d  To: REFER ipsec-
   07E0  696b 650d 0a6b 3d62 6173 6536 343a 3b72  ike..k=base64:;r
   07F0  6566 7265 7368 6572 3d0d 0a61 3d6b 6579  efresher=..a=key
   0800  7764 733a 3b74 7261 6e73 706f 7274 3d0d  wds:;transport=.
   0810  0a61 3d67 726f 7570 3a0d 0a61 3d70 7469  .a=group:..a=pti
   0820  6d65 3a0d 0a6b 3d63 6c65 6172 3a3b 7265  me:..k=clear:;re
   0830  6365 6976 6564 3d3b 6475 7261 7469 6f6e  ceived=;duration
   0840  3d0d 0a53 6572 7665 723a 200d 0a41 6363  =..Server: ..Acc
   0850  6570 743a 200d 0a4d 696e 2d53 453a 2049  ept: ..Min-SE: I
   0860  4e46 4f20 0d0a 6d3d 6461 7461 206d 756c  NFO ..m=data mul
   0870  7469 7061 7274 6d6f 6465 2d73 6574 3d0d  tipartmode-set=.
   0880  0a61 3d74 6f6f 6c3a 0d0a 613d 6c61 6e67  .a=tool:..a=lang
   0890  3a54 4c53 756e 2c20 0d0a 613d 6d69 643a  :TLSun, ..a=mid:
   08A0  0d0a 6b3d 7572 693a 6372 6974 6963 616c  ..k=uri:critical
   08B0  0d0a 4461 7465 3a20 3b6d 6574 686f 643d  ..Date: ;method=
   08C0  0d0a 613d 6361 743a 3b72 6561 736f 6e3d  ..a=cat:;reason=
   08D0  3b6d 6164 6472 3d6f 7061 7175 653d 3b61  ;maddr=opaque=;a
   08E0  6c67 3d54 7565 2c20 4d6f 6e2c 203b 7474  lg=Tue, Mon, ;tt
   08F0  6c3d 5361 742c 2057 6564 2c20 4672 692c  l=Sat, Wed, Fri,
   0900  2061 7574 733d 0d0a 693d 0d0a 7a3d 3b69   auts=..i=..z=;i
   0910  643d 6372 633d 0d0a 723d 0d0a 653d 0d0a  d=crc=..r=..e=..
   0920  753d 7561 733b 713d 3630 3020 4275 7379  u=uas;q=600 Busy
   0930  2045 7665 7279 7768 6572 656a 6563 7465   Everywherejecte
   0940  6434 3830 2054 656d 706f 7261 7269 6c79  d480 Temporarily
   0950  2055 6e61 7661 696c 6162 6c65 0d0a 613d   Unavailable..a=
   0960  7479 7065 3a48 2e33 3332 3032 2041 6363  type:H.33202 Acc
   0970  6570 7465 640d 0a53 6573 7369 6f6e 2d45  epted..Session-E
   0980  7870 6972 6573 3a20 474d 5468 752c 200d  xpires: GMThu, .



Garcia et al.                                                   [Page 8]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   0990  0a50 2d41 7373 6572 7465 642d 4964 656e  .P-Asserted-Iden
   09A0  7469 7479 3a20 4175 6720 0d0a 4d65 6469  tity: Aug ..Medi
   09B0  612d 4175 7468 6f72 697a 6174 696f 6e3a  a-Authorization:
   09C0  204f 6374 200d 0a53 7562 7363 7269 7074   Oct ..Subscript
   09D0  696f 6e2d 5374 6174 653a 204d 6179 200d  ion-State: May .
   09E0  0a41 7373 6572 7465 642d 4964 656e 7469  .Asserted-Identi
   09F0  7479 3a20 4d61 7220 3438 3620 4275 7379  ty: Mar 486 Busy
   0A00  2048 6572 6571 7569 7265 6434 3030 2042   Herequired400 B
   0A10  6164 2052 6571 7565 7374 656c 3a0d 0a61  ad Requestel:..a
   0A20  3d69 6e61 6374 6976 6552 5450 2f53 4156  =inactiveRTP/SAV
   0A30  5020 5254 502f 4156 5046 2075 6470 0d0a  P RTP/AVPF udp..
   0A40  5265 636f 7264 2d52 6f75 7465 3a20 0d0a  Record-Route: ..
   0A50  416c 6c6f 772d 4576 656e 7473 3a20 0d0a  Allow-Events: ..
   0A60  613d 7265 6376 6f6e 6c79 0d0a 4576 656e  a=recvonly..Even
   0A70  743a 2020 2020 0d0a 613d 7365 6e64 6f6e  t:    ..a=sendon
   0A80  6c79 0d0a 633d 494e 2049 5034 200d 0a52  ly..c=IN IP4 ..R
   0A90  6561 736f 6e3a 200d 0a41 6c6c 6f77 3a20  eason: ..Allow:
   0AA0  0d0a 5061 7468 3a20 3b75 7365 723d 0d0a  ..Path: ;user=..
   0AB0  623d 4153 2043 5420 0d0a 5757 572d 4175  b=AS CT ..WWW-Au
   0AC0  7468 656e 7469 6361 7465 3a20 4469 6765  thenticate: Dige
   0AD0  7374 2034 3230 2042 6164 2045 7874 656e  st 420 Bad Exten
   0AE0  7369 6f6e 6f6e 2d72 6563 7572 7365 6e64  sionon-recursend
   0AF0  2d6f 6e6c 790d 0a61 3d73 656e 6472 6563  -only..a=sendrec
   0B00  7669 6465 6f63 7465 742d 616c 6967 6e3d  videoctet-align=
   0B10  3438 3920 4261 6420 4576 656e 7463 7072  489 Bad Eventcpr
   0B20  6563 6f6e 6469 7469 6f6e 6f6e 2d75 7267  econditionon-urg
   0B30  656e 7461 7070 6c69 6361 7469 6f6e 2f73  entapplication/s
   0B40  6470 6174 6865 6164 6572 7370 6175 7468  dpatheaderspauth
   0B50  3d51 2e38 3530 3520 5665 7273 696f 6e20  =Q.8505 Version
   0B60  4e6f 7420 5375 7070 6f72 7465 646f 6d61  Not Supportedoma
   0B70  696e 3d35 3034 2053 6572 7665 7220 5469  in=504 Server Ti
   0B80  6d65 2d6f 7574 696d 6572 656e 6465 7265  me-outimerendere
   0B90  616c 6d3d 4d44 3538 3020 5072 6563 6f6e  alm=MD580 Precon
   0BA0  6469 7469 6f6e 2046 6169 6c75 7265 7370  dition Failuresp
   0BB0  6f6e 7365 3d53 5542 5343 5249 4245 2034  onse=SUBSCRIBE 4
   0BC0  3232 2053 6573 7369 6f6e 2054 696d 6572  22 Session Timer
   0BD0  2054 6f6f 2053 6d61 6c6c 6f63 616c 6970   Too Smallocalip
   0BE0  7365 632d 6d61 6e64 6174 6f72 7934 3133  sec-mandatory413
   0BF0  2052 6571 7565 7374 2045 6e74 6974 7920   Request Entity
   0C00  546f 6f20 4c61 7267 6532 6541 4b41 7631  Too Large2eAKAv1
   0C10  2d4d 4435 2d73 6573 7369 6f6e 6f72 6d61  -MD5-sessionorma
   0C20  6c0d 0a0d 0a50 2d4d 6564 6961 2d41 7574  l....P-Media-Aut
   0C30  686f 7269 7a61 7469 6f6e 3a20 4465 6320  horization: Dec
   0C40  3630 3320 4465 636c 696e 6578 746e 6f6e  603 Declinextnon
   0C50  6365 3d34 3835 2041 6d62 6967 756f 7573  ce=485 Ambiguous
   0C60  6572 6e61 6d65 3d31 3833 2053 6573 7369  ername=183 Sessi
   0C70  6f6e 2050 726f 6772 6573 7369 7073 3a68  on Progressips:h
   0C80  616c 6661 696c 7572 656d 6f74 6572 6d69  alfailuremotermi
   0C90  6e61 7465 6466 616c 7365 7175 656e 7469  natedfalsequenti
   0CA0  616c 676f 7269 7468 6d3d 3430 3120 556e  algorithm=401 Un
   0CB0  6175 7468 6f72 697a 6564 5343 5450 5241  authorizedSCTPRA



Garcia et al.                                                   [Page 9]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   0CC0  434b 200d 0a53 6563 7572 6974 792d 436c  CK ..Security-Cl
   0CD0  6965 6e74 3a20 0d0a 5365 6375 7269 7479  ient: ..Security
   0CE0  2d53 6572 7665 723a 200d 0a53 6563 7572  -Server: ..Secur
   0CF0  6974 792d 5665 7269 6679 3a20 6175 6469  ity-Verify: audi
   0D00  6f70 7469 6f6e 616c 6572 740d 0a74 3d30  optionalert..t=0
   0D10  2030 2e30 2e30 2e30 0d0a 436f 6e74 656e   0.0.0.0..Conten
   0D20  742d 4c65 6e67 7468 3a20 696e 666f 5245  t-Length: infoRE
   0D30  4749 5354 4552 200d 0a41 7574 686f 7269  GISTER ..Authori
   0D40  7a61 7469 6f6e 3a20 3b6c 7265 6665 720d  zation: ;lrefer.
   0D50  0a43 6f6e 7465 6e74 2d54 7970 653a 2031  .Content-Type: 1
   0D60  3830 2052 696e 6769 6e67 0d0a 633d 494e  80 Ringing..c=IN
   0D70  2049 5036 2031 3030 2054 7279 696e 6776   IP6 100 Tryingv
   0D80  3d30 0d0a 6f3d 4e4f 5449 4659 2055 5044  =0..o=NOTIFY UPD
   0D90  4154 4520 0d0a 5375 7070 6f72 7465 643a  ATE ..Supported:
   0DA0  2041 4d52 5450 2f41 5650 200d 0a61 3d72   AMRTP/AVP ..a=r
   0DB0  7470 6d61 703a 0d0a 5072 6976 6163 793a  tpmap:..Privacy:
   0DC0  200d 0a45 7870 6972 6573 3a20 0d0a 5265   ..Expires: ..Re
   0DD0  7175 6972 653a 200d 0a6d 3d61 7564 696f  quire: ..m=audio
   0DE0  200d 0a6d 3d76 6964 656f 200d 0a73 3d20   ..m=video ..s=
   0DF0  0d0a 613d 666d 7470 3a3b 6578 7069 7265  ..a=fmtp:;expire
   0E00  733d 0d0a 613d 6375 7272 3a0d 0a61 3d63  s=..a=curr:..a=c
   0E10  6f6e 663a 0d0a 526f 7574 653a 2069 636f  onf:..Route: ico
   0E20  6e6f 6e65 0d0a 613d 6465 733a 0d0a 5253  none..a=des:..RS
   0E30  6571 3a20 0d0a 5241 636b 3a20 4259 4520  eq: ..RAck: BYE
   0E40  636e 6f6e 6365 3d31 3030 7265 6c71 6f70  cnonce=100relqop
   0E50  3d75 7269 3d6e 633d 716f 7354 4350 5544  =uri=nc=qosTCPUD
   0E60  5078 6d6c 0d0a 5669 613a 2053 4950 2f32  Pxml..Via: SIP/2
   0E70  2e30 2f54 4350 203b 636f 6d70 3d73 6967  .0/TCP ;comp=sig
   0E80  636f 6d70 726f 6261 7469 6f6e 6f2d 7175  comprobationo-qu
   0E90  6575 650d 0a56 6961 3a20 5349 502f 322e  eue..Via: SIP/2.
   0EA0  302f 5544 5020 3b62 7261 6e63 683d 7a39  0/UDP ;branch=z9
   0EB0  6847 3462 4b0d 0a4d 6178 2d46 6f72 7761  hG4bK..Max-Forwa
   0EC0  7264 733a 2049 4e56 4954 4520 416e 6f6e  rds: INVITE Anon
   0ED0  796d 6f75 7369 703a 0d0a 436f 6e74 6163  ymousip:..Contac
   0EE0  743a 200d 0a43 616c 6c2d 4944 3a20 3230  t: ..Call-ID: 20
   0EF0  3020 4f4b 0d0a 4353 6571 3a20 0d0a 4672  0 OK..CSeq: ..Fr
   0F00  6f6d 3a20 0d0a 546f 3a20 3b74 6167 3d0e  om: ..To: ;tag=.
   0F10  d400 040e b500 100f 0400 060e 6b00 070e  ............k...
   0F20  9a00 0c0e 6400 070e c500 060e c500 070e  ....d...........
   0F30  9300 130e d800 0b0e e300 0b0e f400 080e  ................
   0F40  fc00 080f 0a00 050e a600 0f0e 7700 0d0e  ............w...
   0F50  ee00 060e 4000 070e 3c00 030e 3c00 040d  ....@...<...<...
   0F60  9400 0d07 a800 030d 2e00 080d 2e00 090d  ................
   0F70  0000 080b b500 090b b500 0a0d 8600 060d  ................
   0F80  8600 070c bd00 050c bd00 060d 8d00 060d  ................
   0F90  8d00 070c a000 0a0e 5500 030b 9400 030a  ........U.......
   0FA0  b800 140a b800 1b0c 2100 040c 1100 080c  ........!.......
   0FB0  5e00 090e 3400 080e 6100 030d 3700 1105  ^...4...a...7...
   0FC0  cb00 0b0c 0b00 040c 0b00 090e 5100 040d  ............Q...
   0FD0  1800 120d 4f00 100d b600 0b0b 3300 0f0e  ....O.......3...
   0FE0  4d00 040d c100 0b0e 4700 060d f900 090b  M.......G.......



Garcia et al.                                                  [Page 10]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   0FF0  ac00 090c 4900 0a0b 4900 080b 8e00 060b  ....I...I.......
   1000  6c00 070d cc00 0b0c 4d00 060e 1400 090e  l.......M.......
   1010  2c00 080c c300 130c d600 130c e900 130b  ,...............
   1020  1e00 0c0d 4800 030c bf00 030e 5e00 030e  ....H.......^...
   1030  5b00 030c bf00 040e 2000 040d 7500 0a0d  [....... ...u...
   1040  5f00 0b0c 6700 140a cc00 070c aa00 100d  _...g...........
   1050  7f00 070d eb00 040d eb00 050d 6a00 0b0d  ............j...
   1060  0b00 040d 0b00 070d ab00 0b0d f000 090e  ................
   1070  0200 090e 2400 080e 0b00 090d d700 0a0d  ....$...........
   1080  e100 0a0d a300 080e 5800 030b e400 090d  ........X.......
   1090  0000 080e 2000 040c 0800 030b d900 050c  .... ...........
   10A0  8700 060a 7a00 0406 8200 040a f900 080d  ....z...........
   10B0  a100 030e cc00 090a 9700 090a 4e00 100a  ............N...
   10C0  a800 060a 8200 0b01 6d00 050a ae00 040a  ........m.......
   10D0  6a00 0c09 8f00 1709 df00 150a 5e00 0c0a  j...........^...
   10E0  f500 0c0a 7600 0c0a 1d00 0c09 7500 130a  ....v.......u...
   10F0  a000 080b 4100 0409 aa00 170c 2300 190a  ....A.......#...
   1100  8d00 0a0a b200 030a b500 030a 3e00 100a  ............>...
   1110  2900 090a 3200 090c 7a00 0503 d600 020a  )...2...z.......
   1120  1900 040e 6b00 0c0d 4a00 0509 c500 1609  ....k...J.......
   1130  6900 0c0e 6400 1309 4100 1b09 f800 0d09  i...d...A.......
   1140  2800 1305 8b00 040c 9500 0504 6e00 0404  (...........n...
   1150  6e00 0809 0100 0502 7000 1007 da00 090b  n.......p.......
   1160  de00 0902 d300 0508 de00 0506 a300 0702  ................
   1170  2900 0603 da00 0a09 0e00 0405 1600 0603  )...............
   1180  0f00 0802 f200 0807 7500 0309 2200 030b  ........u..."...
   1190  8500 0502 d600 0706 4600 0306 4600 0708  ........F...F...
   11A0  6d00 0908 e800 0508 e300 0508 f700 0509  m...............
   11B0  8a00 0508 fc00 0508 f200 0508 9300 0504  ................
   11C0  d500 0504 bd00 0509 f300 0504 3d00 0509  ............=...
   11D0  da00 0503 ae00 0503 9300 0509 a500 0503  ................
   11E0  c900 0509 c000 0503 7800 050c 3b00 0509  ........x...;...
   11F0  8700 0403 5a00 0702 9700 090b 2d00 060c  ....Z.......-...
   1200  1b00 060b 2900 0a08 3700 0a08 d000 0708  ....)...7.......
   1210  2d00 0a03 5a00 0807 4c00 0607 ee00 0b07  -...Z...L.......
   1220  4c00 0708 5f00 0409 2500 0308 5f00 050b  L..._...%..._...
   1230  4400 060a a900 0407 d400 0508 a800 0807  D...............
   1240  d400 0606 d400 0706 d400 0802 3600 1b07  ............6...
   1250  1800 0a08 4b00 0a08 9100 0305 e600 1302  ....K...........
   1260  c000 1404 9500 1504 8000 1506 6c00 0d03  ............l...
   1270  fa00 170a 0b00 0f05 f900 1305 1c00 1403  ................
   1280  ce00 0d06 5f00 0d04 5800 1605 5600 1201  ...._...X...V...
   1290  a000 2103 e400 1307 6d00 080b ed00 1c02  ..!.....m.......
   12A0  1200 1802 a000 1a02 8000 1a0a d300 1104  ................
   12B0  4200 160b bf00 1b02 fa00 1607 2200 0e01  B..........."...
   12C0  7900 2305 a100 1103 4200 1101 5500 160c  y.#.....B...U...
   12D0  5300 0d03 9800 1702 5b00 1602 dd00 170b  S.......[.......
   12E0  1000 0d05 3000 1305 6800 1201 2400 1f01  ....0...h...$...
   12F0  c600 1905 4300 1305 d700 0f04 1100 170b  ....C...........
   1300  7300 130b 5400 1904 ef00 150b 9600 180c  s...T...........
   1310  ba00 040c 4000 0b01 ed00 1b05 8f00 1204  ....@...........



Garcia et al.                                                  [Page 11]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   1320  da00 1503 7d00 1704 c200 1404 aa00 1408  ....}...........
   1330  b000 0809 0600 0409 1e00 0409 1a00 040a  ................
   1340  2300 0607 0900 0f06 dc00 0f08 5500 0a03  #...........U...
   1350  2900 0709 1600 0409 0a00 0408 2300 0a07  )...........#...
   1360  e300 0b08 a000 0806 c900 0b08 c000 0807  ................
   1370  f900 0b08 7f00 0908 1900 0a07 5300 0d0c  ............S...
   1380  8b00 0a07 8000 0c04 2800 1603 b300 1706  ........(.......
   1390  8a00 1105 0400 1303 1700 1406 0c00 1305  ................
   13A0  7a00 1206 b900 1006 4d00 1206 aa00 0d09  z.......M.......
   13B0  5c00 0e06 7900 1107 b000 0c07 a400 0c08  \...y...........
   13C0  8800 0907 3000 0e07 8c00 0c07 c800 0c08  ....0...........
   13D0  c800 0807 bc00 0c07 6000 0d08 9800 0808  ........`.......
   13E0  0f00 0a03 3000 1203 3000 0d03 6200 1706  ....0...0...b...
   13F0  eb00 0f05 c700 1008 6400 0907 9800 0c08  ........d.......
   1400  4100 0a02 5000 0b0e 8300 0906 fa00 0f07  A...P...........
   1410  3e00 0e0a 3b00 030d 1100 0709 3900 0808  >...;.......9...
   1420  0400 0b0a 3b00 030b 1c00 030c 8200 0706  ....;...........
   1430  3200 0703 5200 0406 b600 0301 4700 0208  2...R.......G...
   1440  b800 0808 ed00 0508 d700 0701 9a00 060b  ................
   1450  0400 0c08 7600 0906 1f00 1305 b200 1509  ....v...........
   1460  1200 0401 de00 0f04 7300 0d07 7700 090b  ........s...w...
   1470  0400 0b01 6900 0f01 7300 0606 5a00 0403  ....i...s...Z...
   1480  f600 0401 0000 0601 2400 0400 1c00 1201  ........$.......
   1490  c600 0403 5500 0505 4300 0401 be00 0805  ....U...C.......
   14A0  d700 0401 4f00 0604 1100 0401 4c00 090b  ....O.......L...
   14B0  7300 0406 3b00 040b 5400 0406 3800 0704  s...;...T...8...
   14C0  ef00 040a e700 070b 9600 040a e300 0b09  ................
   14D0  2800 0402 2e00 080c 4000 040c 9800 0a01  (.......@.......
   14E0  ed00 040e 8e00 0505 8f00 040e 8b00 0804  ................
   14F0  da00 0400 6900 0d00 4e00 0e00 3e00 1000  ....i...N...>...
   1500  2e00 1000 0a00 1200 7600 0c0d 7500 0400  ........v...u...
   1510  8200 0b0d 5f00 0400 5c00 0d0a 8200 0402  ...._...\.......
   1520  3600 0400 8d00 0b07 1800 0400 c900 090c  6...............
   1530  6700 040e 1d00 040e ee00 040d 2a00 0409  g...........*...
   1540  6900 0406 c900 0401 2000 0402 c000 040b  i....... .......
   1550  8900 0604 9500 040c 1500 0704 8000 040d  ................
   1560  0600 0506 6c00 0400 b600 0a03 fa00 040a  ....l...........
   1570  0300 080a 0b00 0401 0d00 040c aa00 0401  ................
   1580  1700 0505 1c00 040c fc00 0503 ce00 040b  ................
   1590  0000 0506 5f00 040e a600 0804 5800 040e  ...._.......X...
   15A0  6b00 0305 5600 040b 5100 0501 a000 0400  k...V...Q.......
   15B0  f900 0703 e400 0401 0c00 0607 6d00 0400  ............m...
   15C0  f200 070b ed00 0403 1700 0400 e300 0802  ................
   15D0  1200 0400 c000 0902 a000 0400 a200 0a05  ................
   15E0  c700 0402 8000 0400 eb00 070a d300 0400  ................
   15F0  9800 0a04 4200 0401 1200 050b bf00 0401  ....B...........
   1600  0600 0602 fa00 0402 b800 0809 4100 0406  ............A...
   1610  3f00 0801 7900 0401 1c00 0405 a100 040c  ?...y...........
   1620  7f00 0403 4200 0402 0600 0c01 5500 040a  ....B.......U...
   1630  ec00 090c 5300 0400 0000 0a09 f800 0406  ....S...........
   1640  9b00 0902 5b00 0400 ac00 0a02 dd00 0401  ....[...........



Garcia et al.                                                  [Page 12]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   1650  4200 0b0b 1000 0400 d200 0905 3000 0400  B...........0...
   1660  db00 0805 6800 04                        ....h..

        Table 1: binary representation of the static SIP/SDP
              dictionary for SigComp

4. Security Considerations

   The security considerations of [1] apply.  This memo does not
   introduce any known additional security risk.

5. IANA Considerations

   None.

6. Authors' Addresses

   Miguel A. Garcia
   Ericsson
   FIN-02420, Jorvas, Finland
   Tel: +358 9299 3553
   e-mail: miguel.a.garcia@ericsson.com

   Carsten Bormann
   Universitaet Bremen TZI
   Postfach 330440
   D-28334 Bremen, Germany
   Tel: +49 421 218 7024
   e-mail: cabo@tzi.org

   Joerg Ott
   Universitaet Bremen TZI
   Bibliothekstr. 1
   Bremen  28359, Germany
   Tel: +49.421.201-7028
   e-mail: jo@tzi.uni-bremen.de

   Richard Price
   Roke Manor Research Ltd
   Romsey, Hants, SO51 0ZN, United Kingdom
   Tel:  +44 1794 833681
   e-mail: richard.price@roke.co.uk

   Adam Roach
   dynamicsoft
   5100 Tennyson Parkway, Suite 1200
   Plano, TX 75024, USA
   e-mail: adam@dynamicsoft.com






Garcia et al.                                                  [Page 13]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

7. Acknowledgements

   The authors would like to thank Lars-Erik Jonsson, Zhigang C. Liu and
   Jonathan Rosenberg for their valuable comments.

8. References

8.1 Normative references

   1. R. Price, H. Hannu, C. Bormann, J. Christoffersson, Z. Liu, J.
      Rosenberg, Signaling Compression (SigComp), draft-ietf-rohc-
      sigcomp-06.txt, May 2002, work in progress.


8.2 Informative references

   2. J. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J.
      Peterson, R. Sparks, M. Handley, E. Schooler, Session Initiation
      Protocol, Request for Comments 3261, May 2002.

   3. M. Garcia et al, 3GPP requirements on SIP, draft-sipping-garcia-
      3gpp-reqs-03.txt, work in progress.

   4. F. Yergeau, "UTF-8, a transformation format of ISO 10646," Request
      for Comments 2279, Internet Engineering Task Force, Jan.  1998.

   5. J. Franks, P. Hallam-Baker, J. Hostetler, S. Lawrence, P. Leach,
      A. Luotonen, L. Stewart, HTTP Authentication: Basic and Digest
      Access Authentication, Request for Comments 2617, June 1999.

   6. A. Vaha-Sipila, URLs for telephone calls, Request for Comments
      2806, Internet Engineering Task Force, Apr. 2000.

   7. S. Donovan, The SIP INFO Method, Request for Comments 2976,
      October 2000.

   8. A. Roach, SIP-Specific Event Notification, Request for Comments
      3265, May 2002.

   9. J. Rosenberg, H. Schulzrinne, Reliability of Provisional Responses
      in SIP, Request for Comments 3262, May 2002.

   10. J. Rosenberg, The Session Initiation Protocol UPDATE Method,
      draft-ietf-sip-update-02.txt, April 2002, work in progress.

   11. G. Camarillo, W. Marshall, J. Rosenberg, Integration of Resource
      Management and SIP, draft-ietf-sip-manyfolks-resource-07.txt,
      April 2002, work in progress.

   12. R. Sparks, The Refer Method, draft-sparks-sip-refer-split-00,
      April 2002, work in progress.



Garcia et al.                                                  [Page 14]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   13. R. Mahy, B. Biggs, R. Dean, The SIP Replaces header, draft-ietf-
      sip-replaces-01.txt, April 2002, work in progress.

   14. R. Sparks, Internet Media Types message/sip and message/sipfrag,
      draft-sparks-sip-mimetypes-03.txt, April 2002, work in progress.

   15. D. Willis, B. Hoeneisen, SIP Extension for Registering Non-
      Adjacent Contacts, draft-willis-sip-path-07.txt, May 2002, work in
      progress.

   16. H. Schulzrinne, D. Oran, G. Camarillo, The Reason Header Field
      for the Session Initiation Protocol, draft-ietf-sip-reason-
      00.txt, April 2002, work in progress.

   17. S. Donovan, J. Rosenberg, The SIP Session Timer, draft-ietf-sip-
      session-timer-08.txt, October 2001, work in progress.

   18. A. Niemi, J. Arkko, V. Torvinen, HTTP Digest Authentication Using
      AKA, draft-ietf-sip-digest-aka-03, May 2002, work in progress.

   19. J. Arkko, V. Torvinen, G. Camarillo, T. Haukka, S. Sen, Security
      Mechanism Agreement for SIP Sessions, draft-ietf-sip-sec-agree-
      01.txt, May 2002, working progress.

   20. B. Campbell, J. Rosenberg, D. Willis, R. Sparks, H. Schulzrinne,
      J. Lennox, C. Huitema, B. Aboba, D. Gurle, D. Oran, Session
      Initiation Protocol Extension for Instant Messaging, draft-ietf-
      sip-message-03, April 2002, work in progress.

   21. W. Marshall, F. Andreasen, D. Evans, SIP Extensions for Media
      Authorization, draft-ietf-sip-call-auth-05.txt, May 2002, work in
      progress.

   22. H. Schulzrinne, J. Rosenberg, SIP Caller Preferences and Callee
      Capabilities, draft-ietf-sip-callerprefs-04.txt, December 2001,
      work in progress.

   23. G. Camarillo, Compressing the Session Initiation Protocol, draft-
      camarillo-sip-compression-01.txt, May 2002, work in progress.

   24. M. Handley, V. Jacobson, C. Perkins, SDP: Session Description
      Protocol, draft-ietf-mmusic-sdp-new-09.txt, May 2002, work in
      progress.

   25. J Sjoberg, M. Westerlund, A. Lakaniemi, Q. Xie, RTP payload
      format and file storage format for the Adaptive Multi-Rate (AMR)
      and Adaptive Multi-Rate Wideband (AMR-WB) audio codecs, draft-
      ietf-avt-rtp-amr-13.txt, January 2002, work in progress.

   26. G. Camarillo, J. Holler, G. AP Eriksson, H. Schulzrinne, Grouping
      of media lines in SDP, draft-ietf-mmusic-fid-06.txt, February



Garcia et al.                                                  [Page 15]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

      2002, work in progress.

   27. H. Schulzrinne, S. Petrack, RTP Payload for DTMF Digits,
      Telephony Tones and Telephony Signals, RFC 2833, May 2000.

   28. J. Arkko, E. Carrara, F. Lindholm, M. Naslund, K. Norrman, Key
      Management Extensions for SDP and RTSP, draft-ietf-mmusic-kmgmt-
      ext-04.txt, April 2002, work in progress.

   29. J. Arkko, E. Carrara, F. Lindholm, M. Naslund, K. Norrman, MIKEY:
      Multimedia Internet KEYing, draft-ietf-msec-mikey-01.txt February
      2002.

   30. M. Baugher, R. Blom, E. Carrara, D. McGrew, M. Naslund, K.
      Norrman, D. Oran, The Secure Real Time Transport Protocol, draft-
      ietf-avt-srtp-04.txt, May 2002, work in progress.

   31. J. Ott, S. Wenger, S. Fukunaga, N. Sato, K. Yano, A. Miyazaki, K.
      Hata, R. Hakenberg, C. Burmeister, Extended RTP Profile for RTCP-
      based feedback (RTP/AVPF), draft-ietf-avt-rtcp-feedback- 02.txt,
      March 2002, work in progress.

   32. J. Rosenberg, H.Schulzrinne, An Offer/Answer Model with SDP, RFC
      3264.

   33. C. Jennings, J. Peterson, M. Watson, Extensions to the Session
      Initiation Protocol (SIP) for Asserted Identity within Trusted
      Networks, draft-ietf-sip-asserted-identity-00, May 2002, work in
      progress.

   34. J. Peterson, A Privacy Mechanism for the Session Initiation
      Protocol (SIP), draft-ietf-sip-privacy-general-00.txt, May 2002,
      work in progress.





















Garcia et al.                                                  [Page 16]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

Appendix A. SIP input strings to the SIP/SDP static dictionary

   For reference, this section lists the SIP input strings that were
   used in generating the dictionary, as well as a priority value, the
   offset of the string in the generated dictionary, the length of the
   string, and one or more references into the referenced documents that
   motivate the presence of this string.  Note that the notation
   "[CRLF]" stands for a sequence of two bytes with the values 0x0d and
   0x0a, respectively.

   The priority value is used for determining the position of the string
   in the dictionary.  Lower priority values (higher priorities) cause
   the string to occur at a later position in the dictionary, making it
   more efficient to reference the string in certain compression
   algorithms.  Hence, small priority values were assigned to strings
   more likely to occur.

   String                                Pr Off  Len  References
   ===================================== == ==== ==== ==========
   "sip:"                                 1 0ED4 0004 [2] 19.1.1
   "sips:"                                3 0C7A 0005 [2] 19.1.1
   "tel:"                                 3 0A19 0004 [6] 2.2
   "SIP/2.0"                              1 0E6B 0007 [2] 25.1
   "SIP/2.0/UDP "                         1 0E9A 000C [2] 25.1
   "SIP/2.0/TCP "                         3 0E6B 000C [2] 25.1
   "INVITE"                               1 0EC5 0006 [2] 25.1
   "INVITE "                              1 0EC5 0007 [2] 25.1
   "ACK"                                  2 0CBF 0003 [2] 25.1
   "ACK "                                 2 0CBF 0004 [2] 25.1
   "OPTIONS"                              4 035A 0007 [2] 25.1
   "OPTIONS "                             4 035A 0008 [2] 25.1
   "BYE"                                  2 0E3C 0003 [2] 25.1
   "BYE "                                 2 0E3C 0004 [2] 25.1
   "CANCEL"                               4 074C 0006 [2] 25.1
   "CANCEL "                              4 074C 0007 [2] 25.1
   "REGISTER"                             2 0D2E 0008 [2] 25.1
   "REGISTER "                            2 0D2E 0009 [2] 25.1
   "INFO"                                 4 085F 0004 [7] 2
   "INFO "                                4 085F 0005 [7] 2
   "SUBSCRIBE"                            2 0BB5 0009 [8] 8.1.1
   "SUBSCRIBE "                           2 0BB5 000A [8] 8.1.1
   "NOTIFY"                               2 0D86 0006 [8] 8.1.2
   "NOTIFY "                              2 0D86 0007 [8] 8.1.2
   "PRACK"                                2 0CBD 0005 [9] 6
   "PRACK "                               2 0CBD 0006 [9] 6
   "UPDATE"                               2 0D8D 0006 [10] 7, 10
   "UPDATE "                              2 0D8D 0007 [10] 7, 10
   "REFER"                                4 07D4 0005 [12] 3, 10
   "REFER "                               4 07D4 0006 [12] 3, 10
   "MESSAGE"                              4 06D4 0007 [20] 9
   "MESSAGE "                             4 06D4 0008 [20] 9



Garcia et al.                                                  [Page 17]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "[CRLF]Accept: "                       4 084B 000A [2] 20.1
   "[CRLF]Accept-Contact: "               5 001C 0012 [22] 5
   "[CRLF]Accept-Encoding: "              4 05E6 0013 [2] 20.2
   "[CRLF]Accept-Language: "              4 05F9 0013 [2] 20.3
   "[CRLF]Alert-Info: "                   4 0722 000E [2] 20.4
   "[CRLF]Allow: "                        3 0A97 0009 [2] 20.5
   "[CRLF]Allow-Events: "                 3 0A4E 0010 [8] 8.2.1
   "[CRLF]Authentication-Info: "          4 0398 0017 [2] 20.6
   "[CRLF]Authorization: "                2 0D37 0011 [2] 20.7
   "[CRLF]Call-ID: "                      1 0EE3 000B [2] 20.8
   "[CRLF]Call-Info: "                    5 0069 000D [2] 20.9
   "[CRLF]Contact: "                      1 0ED8 000B [2] 20.10
   "[CRLF]Content-Disposition: "          4 037D 0017 [2] 20.11
   "[CRLF]Content-Encoding: "             4 04C2 0014 [2] 20.12
   "[CRLF]Content-Language: "             4 04AA 0014 [2] 20.13
   "[CRLF]Content-Length: "               2 0D18 0012 [2] 20.14
   "[CRLF]Content-Type: "                 2 0D4F 0010 [2] 20.15
   "[CRLF]CSeq: "                         1 0EF4 0008 [2] 20.16
   "[CRLF]Date: "                         4 08B0 0008 [2] 20.17
   "[CRLF]Error-Info: "                   5 004E 000E [2] 20.18
   "[CRLF]Event:    "                     3 0A6A 000C [8] 8.2.1
   "[CRLF]Expires: "                      2 0DC1 000B [2] 20.19
   "[CRLF]From: "                         1 0EFC 0008 [2] 20.20
   "[CRLF]In-Reply-To: "                  4 0709 000F [2] 20.21
   "[CRLF]Max-Forwards: "                 1 0EB5 0010 [2] 20.22
   "[CRLF]Min-Expires: "                  4 06DC 000F [2] 20.23
   "[CRLF]Min-SE: "                       4 0855 000A [17] 5
   "[CRLF]MIME-Version: "                 5 003E 0010 [2] 20.24
   "[CRLF]P-Asserted-Identity: "          3 098F 0017 [33] 13.1
   "[CRLF]Asserted-Identity: "            3 09DF 0015 [33] 13.1
   "[CRLF]Organization: "                 5 002E 0010 [2] 20.25
   "[CRLF]Path: "                         3 0AA0 0008 [15] 3
   "[CRLF]Priority: "                     4 0780 000C [2] 20.26
   "[CRLF]Privacy: "                      2 0DB6 000B [34] 4.2
   "[CRLF]Proxy-Authenticate: "           4 0428 0016 [2] 20.27
   "[CRLF]Proxy-Authorization: "          4 03B3 0017 [2] 20.28
   "[CRLF]Proxy-Require: "                4 068A 0011 [2] 20.29
   "[CRLF]P-Media-Authorization: "        3 0C23 0019 [21] 5.1, 9
   "[CRLF]Media-Authorization: "          3 09AA 0017 [21] 5.1, 9
   "[CRLF]RAck: "                         2 0E34 0008 [9] 7.2
   "[CRLF]Reason: "                       3 0A8D 000A [16] 2
   "[CRLF]Record-Route: "                 3 0A3E 0010 [2] 20.30
   "[CRLF]Refer-To: "                     4 07C8 000C [12] 3, 10
   "[CRLF]Reject-Contact: "               5 000A 0012 [22] 5
   "[CRLF]Replaces: "                     4 07BC 000C [13] 3.1
   "[CRLF]Reply-To: "                     5 0076 000C [2] 20.31
   "[CRLF]Request-Disposition: "          4 0362 0017 [22] 5
   "[CRLF]Require: "                      2 0DCC 000B [2] 20.32
   "[CRLF]Retry-After: "                  4 06EB 000F [2] 20.33
   "[CRLF]Route: "                        2 0E14 0009 [2] 20.34
   "[CRLF]RSeq: "                         2 0E2C 0008 [9] 7.1



Garcia et al.                                                  [Page 18]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "[CRLF]Security-Client: "              2 0CC3 0013 [19] 3.3
   "[CRLF]Security-Server: "              2 0CD6 0013 [19] 3.3
   "[CRLF]Security-Verify: "              2 0CE9 0013 [19] 3.3
   "[CRLF]Server: "                       4 0841 000A [2] 20.35
   "[CRLF]Session-Expires: "              3 0975 0013 [17] 4
   "[CRLF]Subject: "                      5 0082 000B [2] 20.36
   "[CRLF]Subscription-State: "           3 09C5 0016 [8] 8.2.3
   "[CRLF]Supported: "                    2 0D94 000D [2] 20.37
   "[CRLF]Timestamp: "                    5 005C 000D [2] 20.38
   "[CRLF]To: "                           1 0F04 0006 [2] 20.39
   "[CRLF]Unsupported: "                  4 06FA 000F [2] 20.40
   "[CRLF]User-Agent: "                   4 073E 000E [2] 20.41
   "[CRLF]Via: "                          1 0E64 0007 [2] 20.42
   "[CRLF]Via: SIP/2.0/UDP "              1 0E93 0013 [2] 20.42
   "[CRLF]Via: SIP/2.0/TCP "              3 0E64 0013 [2] 20.42
   "[CRLF]Warning: "                      5 008D 000B [2] 20.43
   "[CRLF]WWW-Authenticate: "             2 0AB8 0014 [2] 20.44
   "[CRLF]WWW-Authenticate: Digest "      2 0AB8 001B [2] 20.44
   "[CRLF][CRLF]"                         2 0C21 0004 [2] 7
   ";transport="                          4 0804 000B [2] 25.1
   "udp"                                  4 0A3B 0003 [2] 25.1,
                                            [24] A, [2] 25.1, [24] A
   "tcp"                                  4 0B1C 0003 [2] 25.1
   "sctp"                                 4 0352 0004 [2] 25.1
   "tls"                                  4 06B6 0003 [2] 25.1,
                                            [19] 3.3
   ";user="                               3 0AA8 0006 [2] 25.1
   "phone"                                3 016D 0005 [2] 25.1
   "ip"                                   4 0147 0002 [2] 25.1
   ";method="                             4 08B8 0008 [2] 25.1
   ";ttl="                                4 08ED 0005 [2] 25.1
   ";lr"                                  2 0D48 0003 [2] 25.1
   "Digest "                              2 0ACC 0007 [5] 3.2.1,
                                            3.2.2
   "username="                            2 0C5E 0009 [5] 3.2.2
   "uri="                                 2 0E51 0004 [5] 3.2.2
   "qop="                                 2 0E4D 0004 [5] 3.2.1,
                                            3.2.2
   "cnonce="                              2 0E40 0007 [5] 3.2.2
   "nc="                                  2 0E55 0003 [5] 3.2.2
   "response="                            2 0BAC 0009 [5] 3.2.2
   "nextnonce="                           2 0C49 000A [5] 3.2.3
   "rspauth="                             2 0B49 0008 [5] 3.2.3
   "realm="                               2 0B8E 0006 [5] 3.2.1
   "domain="                              2 0B6C 0007 [5] 3.2.1
   "nonce="                               2 0C4D 0006 [5] 3.2.1
   "opaque="                              4 08D7 0007 [5] 3.2.1
   "stale="                               4 019A 0006 [5] 3.2.1
   "true"                                 4 058B 0004 [5] 3.2.1,
                                            [22] 5.2
   "false"                                4 0C95 0005 [5] 3.2.1



Garcia et al.                                                  [Page 19]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "algorithm="                           2 0CA0 000A [5] 3.2.1,
                                            [18] 3.1
   "MD5"                                  2 0B94 0003 [5] 3.2.1,
                                            [18] 3.1
   "MD5-sess"                             2 0C11 0008 [5] 3.2.1,
                                            [18] 3.1
   "auth"                                 4 046E 0004 [5] 3.2.1
   "auth-int"                             4 046E 0008 [5] 3.2.1
   "AKAv"                                 2 0C0B 0004 [18] 3.1, 6
   "AKAv1-MD5"                            2 0C0B 0009 [18] 3.1, 6
   "auts="                                4 0901 0005 [18] 3.4
   "digest-integrity"                     4 0270 0010 [19] 3.3
   "ipsec-ike"                            4 07DA 0009 [19] 3.3
   "ipsec-man"                            4 0BDE 0009 [19] 3.3
   "smime"                                4 02D3 0005 [19] 3.3
   ";alg="                                4 08DE 0005 [19] 3.3
   ";purpose="                            5 00C9 0009 [2] 20.9
   "icon"                                 5 0E1D 0004 [2] 20.9, 20.11
   "info"                                 5 0D2A 0004 [2] 20.9
   "card"                                 5 0120 0004 [2] 20.9
   ";expires="                            2 0DF9 0009 [2] 25.1,
                                            [8] 8.4
   "render"                               5 0B89 0006 [2] 20.11
   "session"                              5 0C15 0007 [2] 20.11,
                                            [34] 4.2
   "alert"                                5 0D06 0005 [2] 20.11
   ";handling="                           5 00B6 000A [2] 20.11
   "optional"                             2 0D00 0008 [2] 20.11,
                                            [11] 4, [2] 20.11, [11] 4
   "required"                             5 0A03 0008 [2] 20.11
   "text"                                 5 010D 0004 [2] 25.1
   "image"                                5 0117 0005 [2] 25.1
   "audio"                                5 0CFC 0005 [2] 25.1
   "video"                                5 0B00 0005 [2] 25.1
   "application"                          2 05CB 000B [2] 25.1
   "application/sdp"                      2 0B33 000F [2] 25.1
   "message"                              4 02D6 0007 [2] 25.1,
   "sip"                                  4 0646 0003 [14] 1
   "sipfrag"                              4 0646 0007 [14] 2
   "multipart"                            4 086D 0009 [2] 25.1, 7.4.1
   "sdp"                                  2 07A8 0003
   "xml"                                  2 0E61 0003
   "Mon, "                                4 08E8 0005 [2] 25.1
   "Tue, "                                4 08E3 0005 [2] 25.1
   "Wed, "                                4 08F7 0005 [2] 25.1
   "Thu, "                                4 098A 0005 [2] 25.1
   "Fri, "                                4 08FC 0005 [2] 25.1
   "Sat, "                                4 08F2 0005 [2] 25.1
   "Sun, "                                4 0893 0005 [2] 25.1
   " Jan "                                4 04D5 0005 [2] 25.1
   " Feb "                                4 04BD 0005 [2] 25.1



Garcia et al.                                                  [Page 20]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   " Mar "                                4 09F3 0005 [2] 25.1
   " Apr "                                4 043D 0005 [2] 25.1
   " May "                                4 09DA 0005 [2] 25.1
   " Jun "                                4 03AE 0005 [2] 25.1
   " Jul "                                4 0393 0005 [2] 25.1
   " Aug "                                4 09A5 0005 [2] 25.1
   " Sep "                                4 03C9 0005 [2] 25.1
   " Oct "                                4 09C0 0005 [2] 25.1
   " Nov "                                4 0378 0005 [2] 25.1
   " Dec "                                4 0C3B 0005 [2] 25.1
   " GMT"                                 4 0987 0004 [2] 25.1
   ";tag="                                1 0F0A 0005 [2] 25.1
   "emergency"                            4 0297 0009 [2] 20.26
   "urgent"                               4 0B2D 0006 [2] 20.26
   "normal"                               4 0C1B 0006 [2] 20.26
   "non-urgent"                           4 0B29 000A [2] 20.26
   ";duration="                           4 0837 000A [2] 20.33
   ";maddr="                              4 08D0 0007 [2] 20.42
   ";received="                           4 082D 000A [2] 20.42
   ";branch="                             5 0EA6 0008 [2] 20.42
   ";branch=z9hG4bK"                      1 0EA6 000F [2] 8.1.1.7
   "SIP"                                  5 0E6B 0003 [2] 25.1,
                                            [16] 2
   "UDP"                                  2 0E5E 0003 [2] 20.42
   "TCP"                                  2 0E5B 0003 [2] 20.42
   "TLS"                                  4 0891 0003 [2] 20.42
   "SCTP"                                 4 0CBA 0004 [2] 20.42
   "active"                               4 0A23 0006 [8] 8.4
   "pending"                              4 0329 0007 [8] 8.4
   "terminated"                           4 0C8B 000A [8] 8.4
   ";reason="                             4 08C8 0008 [8] 8.4
   ";retry-after="                        4 0760 000D [8] 8.4
   "deactivated"                          4 0250 000B [8] 8.4
   "probation"                            4 0E83 0009 [8] 8.4
   "rejected"                             4 0939 0008 [8] 8.4
   "timeout"                              4 06A3 0007 [8] 8.4
   "giveup"                               4 0229 0006 [8] 8.4
   "noresource"                           4 03DA 000A [8] 8.4
   ";id="                                 4 090E 0004 [8] 8.4
   "100rel"                               2 0E47 0006 [9] 8.1
   "precondition"                         2 0B1E 000C [11] 8
   "refer"                                3 0D4A 0005 [12] 10
   "to-tag"                               4 0516 0006 [13] 3.2
   "from-tag"                             4 030F 0008 [13] 3.2
   "replaces"                             4 02F2 0008 [13] 3.4
   "Q.850"                                5 0B51 0005 [16] 2
   ";cause="                              5 00F9 0007 [16] 2
   ";text="                               5 010C 0006 [16] 2
   "path"                                 3 0B41 0004 [15] 3
   ";refresher="                          4 07EE 000B [17] 4
   "uac"                                  4 0775 0003 [17] 4



Garcia et al.                                                  [Page 21]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "uas"                                  4 0922 0003 [17] 4
   "timer"                                4 0B85 0005 [17] 7.1
   ";class="                              5 00F2 0007 [22] 5.1
   ";duplex="                             5 00E3 0008 [22] 5.1
   ";feature="                            5 00C0 0009 [22] 5.1
   ";language="                           5 00A2 000A [22] 5.1
   ";media="                              5 00EB 0007 [22] 5.1
   ";mobility="                           5 0098 000A [22] 5.1
   "fixed"                                5 0112 0005 [22] 5.1
   "mobile"                               5 0106 0006 [22] 5.1
   "personal"                             5 02B8 0008 [22] 5.1
   "business"                             5 063F 0008 [22] 5.1
   "full"                                 5 011C 0004 [22] 5.1
   "half"                                 5 0C7F 0004 [22] 5.1
   "receive-only"                         5 0206 000C [22] 5.1
   "send-only"                            5 0AEC 0009 [22] 5.1
   "voice-mail"                           5 0000 000A [22] 5.1
   "attendant"                            5 069B 0009 [22] 5.1
   ";priority="                           5 00AC 000A [22] 5.1
   "description"                          5 0142 000B [22] 5.1
   ";methods="                            5 00D2 0009 [22] 5.1
   ";scheme="                             5 00DB 0008 [22] 5.2
   ";only="                               5 0100 0006 [22] 5.2
   ";q="                                  4 0925 0003 [2] 25.1,
                                            [22] 5.2, [19] 3.3
   "proxy"                                5 0355 0005 [22] 5.5
   "redirect"                             5 01BE 0008 [22] 5.5
   "cancel"                               5 014F 0006 [22] 5.5
   "no-cancel"                            5 014C 0009 [22] 5.5
   "fork"                                 5 063B 0004 [22] 5.5
   "no-fork"                              5 0638 0007 [22] 5.5
   "recurse"                              5 0AE7 0007 [22] 5.5
   "non-recurse"                          5 0AE3 000B [22] 5.5
   "parallel"                             5 022E 0008 [22] 5.5
   "sequential"                           5 0C98 000A [22] 5.5
   "queue"                                5 0E8E 0005 [22] 5.5
   "no-queue"                             5 0E8B 0008 [22] 5.5
   ";comp=sigcomp"                        1 0E77 000D [23] 6
   "header"                               4 0B44 0006 [34] 4.2
   "user"                                 4 0AA9 0004 [34] 4.2
   "none"                                 2 0E20 0004 [34] 4.2,
                                            [11] 4
   "critical"                             4 08A8 0008 [34] 4.2
   "id"                                   3 03D6 0002 [33] 13.1
   "100 "                                 5 0D75 0004 [2] 21.1.1
   "100 Trying"                           2 0D75 000A [2] 21.1.1
   "180 "                                 5 0D5F 0004 [2] 21.1.2
   "180 Ringing"                          2 0D5F 000B [2] 21.1.2
   "181 "                                 5 0236 0004 [2] 21.1.3
   "181 Call Is Being Forwarded"          4 0236 001B [2] 21.1.3
   "182 "                                 5 0718 0004 [2] 21.1.4



Garcia et al.                                                  [Page 22]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "182 Queued"                           4 0718 000A [2] 21.1.4
   "183 "                                 5 0C67 0004 [2] 21.1.5
   "183 Session Progress"                 2 0C67 0014 [2] 21.1.5
   "200 "                                 5 0EEE 0004 [2] 21.2.1
   "200 OK"                               1 0EEE 0006 [2] 21.2.1
   "202 "                                 5 0969 0004 [8] 8.3.1
   "202 Accepted"                         3 0969 000C [8] 8.3.1
   "300 "                                 5 02C0 0004 [2] 21.3.1
   "300 Multiple Choices"                 4 02C0 0014 [2] 21.3.1
   "301 "                                 5 0495 0004 [2] 21.3.2
   "301 Moved Permanently"                4 0495 0015 [2] 21.3.2
   "302 "                                 5 0480 0004 [2] 21.3.3
   "302 Moved Temporarily"                4 0480 0015 [2] 21.3.3
   "305 "                                 5 066C 0004 [2] 21.3.4
   "305 Use Proxy"                        4 066C 000D [2] 21.3.4
   "380 "                                 5 03FA 0004 [2] 21.3.5
   "380 Alternative Service"              4 03FA 0017 [2] 21.3.5
   "400 "                                 5 0A0B 0004 [2] 21.4.1
   "400 Bad Request"                      4 0A0B 000F [2] 21.4.1
   "401 "                                 5 0CAA 0004 [2] 21.4.2
   "401 Unauthorized"                     2 0CAA 0010 [2] 21.4.2
   "402 "                                 5 051C 0004 [2] 21.4.3
   "402 Payment Required"                 4 051C 0014 [2] 21.4.3
   "403 "                                 5 03CE 0004 [2] 21.4.4
   "403 Forbidden"                        4 03CE 000D [2] 21.4.4
   "404 "                                 5 065F 0004 [2] 21.4.5
   "404 Not Found"                        4 065F 000D [2] 21.4.5
   "405 "                                 5 0458 0004 [2] 21.4.6
   "405 Method Not Allowed"               4 0458 0016 [2] 21.4.6
   "406 "                                 5 0556 0004 [2] 21.4.7
   "406 Not Acceptable"                   4 0556 0012 [2] 21.4.7
   "407 "                                 5 01A0 0004 [2] 21.4.8
   "407 Proxy Authentication Required"    4 01A0 0021 [2] 21.4.8
   "408 "                                 5 03E4 0004 [2] 21.4.9
   "408 Request Timeout"                  4 03E4 0013 [2] 21.4.9
   "410 "                                 5 076D 0004 [2] 21.4.10
   "410 Gone"                             4 076D 0008 [2] 21.4.10
   "413 "                                 5 0BED 0004 [2] 21.4.11
   "413 Request Entity Too Large"         4 0BED 001C [2] 21.4.11
   "414 "                                 5 0212 0004 [2] 21.4.12
   "414 Request-URI Too Long"             4 0212 0018 [2] 21.4.12
   "415 "                                 5 02A0 0004 [2] 21.4.13
   "415 Unsupported Media Type"           4 02A0 001A [2] 21.4.13
   "416 "                                 5 0280 0004 [2] 21.4.14
   "416 Unsupported URI Scheme"           4 0280 001A [2] 21.4.14
   "420 "                                 5 0AD3 0004 [2] 21.4.15
   "420 Bad Extension"                    4 0AD3 0011 [2] 21.4.15
   "421 "                                 5 0442 0004 [2] 21.4.16
   "421 Extension Required"               4 0442 0016 [2] 21.4.16
   "422 "                                 5 0BBF 0004 [17] 6
   "422 Session Timer Too Small"          4 0BBF 001B [17] 6



Garcia et al.                                                  [Page 23]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "423 "                                 5 02FA 0004 [2] 21.4.17
   "423 Interval Too Brief"               4 02FA 0016 [2] 21.4.17
   "480 "                                 5 0941 0004 [2] 21.4.18
   "480 Temporarily Unavailable"          3 0941 001B [2] 21.4.18
   "481 "                                 5 0179 0004 [2] 21.4.19
   "481 Call/Transaction Does Not Exist"  4 0179 0023 [2] 21.4.19
   "482 "                                 5 05A1 0004 [2] 21.4.20
   "482 Loop Detected"                    4 05A1 0011 [2] 21.4.20
   "483 "                                 5 0342 0004 [2] 21.4.21
   "483 Too Many Hops"                    4 0342 0011 [2] 21.4.21
   "484 "                                 5 0155 0004 [2] 21.4.22
   "484 Address Incomplete"               4 0155 0016 [2] 21.4.22
   "485 "                                 5 0C53 0004 [2] 21.4.23
   "485 Ambiguous"                        4 0C53 000D [2] 21.4.23
   "486 "                                 5 09F8 0004 [2] 21.4.24
   "486 Busy Here"                        3 09F8 000D [2] 21.4.24
   "487 "                                 5 025B 0004 [2] 21.4.25
   "487 Request Terminated"               4 025B 0016 [2] 21.4.25
   "488 "                                 5 02DD 0004 [2] 21.4.26
   "488 Not Acceptable Here"              4 02DD 0017 [2] 21.4.26
   "489 "                                 5 0B10 0004 [8] 8.3.2
   "489 Bad Event"                        4 0B10 000D [8] 8.3.2
   "491 "                                 5 0530 0004 [2] 21.4.27
   "491 Request Pending"                  4 0530 0013 [2] 21.4.27
   "493 "                                 5 0568 0004 [2] 21.4.28
   "493 Undecipherable"                   4 0568 0012 [2] 21.4.28
   "494 "                                 5 0124 0004 [19] 3.3.1
   "494 Security Agreement Required"      4 0124 001F [19] 3.3.1
   "500 "                                 5 01C6 0004 [2] 21.5.1
   "500 Server Internal Error"            4 01C6 0019 [2] 21.5.1
   "501 "                                 5 0543 0004 [2] 21.5.2
   "501 Not Implemented"                  4 0543 0013 [2] 21.5.2
   "502 "                                 5 05D7 0004 [2] 21.5.3
   "502 Bad Gateway"                      4 05D7 000F [2] 21.5.3
   "503 "                                 5 0411 0004 [2] 21.5.4
   "503 Service Unavailable"              4 0411 0017 [2] 21.5.4
   "504 "                                 5 0B73 0004 [2] 21.5.5
   "504 Server Time-out"                  4 0B73 0013 [2] 21.5.5
   "505 "                                 5 0B54 0004 [2] 21.5.6
   "505 Version Not Supported"            4 0B54 0019 [2] 21.5.6
   "513 "                                 5 04EF 0004 [2] 21.5.7
   "513 Message Too Large"                4 04EF 0015 [2] 21.5.7
   "580 "                                 5 0B96 0004 [11] 8
   "580 Precondition Failure"             4 0B96 0018 [11] 8
   "600 "                                 5 0928 0004 [2] 21.6.1
   "600 Busy Everywhere"                  3 0928 0013 [2] 21.6.1
   "603 "                                 5 0C40 0004 [2] 21.6.2
   "603 Decline"                          4 0C40 000B [2] 21.6.2
   "604 "                                 5 01ED 0004 [2] 21.6.3
   "604 Does Not Exist Anywhere"          4 01ED 001B [2] 21.6.3
   "606 "                                 5 058F 0004 [2] 21.6.4



Garcia et al.                                                  [Page 24]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "606 Not Acceptable"                   4 058F 0012 [2] 21.6.4
   "687 "                                 5 04DA 0004 [13] 3.5
   "687 Dialog Terminated"                4 04DA 0015 [13] 3.5
   "Anonymous"                            3 0ECC 0009 [2] 8.1.1.3


        Table A.1: SIP input strings for the SIP/SDP dictionary















































Garcia et al.                                                  [Page 25]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

Appendix B. SDP input strings to the SIP/SDP static dictionary

   For reference, this section lists the SDP input strings that were
   used in generating the dictionary, as well as a priority value, the
   offset of the string in the generated dictionary, the length of the
   string, and one or more references into the referenced documents that
   motivate the presence of this string.  Note that the notation
   "[CRLF]" stands for a sequence of two bytes with the values 0x0d and
   0x0a, respectively.

   The priority value is used for determining the position of the string
   in the dictionary.  Lower priority values (higher priorities) cause
   the string to occur at a later position in the dictionary, making it
   more efficient to reference the string in certain compression
   algorithms.  Hence, small priority values were assigned to strings
   more likely to occur.

   String                                Pr Off  Len  References
   ===================================== == ==== ==== ==========
   "v=0[CRLF]o="                          2 0D7F 0007 [24] 6
   "[CRLF]s="                             2 0DEB 0004 [24] 6
   "[CRLF]s= "                            2 0DEB 0005 [32] 5
   "[CRLF]i="                             4 0906 0004 [24] 6
   "[CRLF]u="                             4 091E 0004 [24] 6
   "[CRLF]e="                             4 091A 0004 [24] 6
   "[CRLF]c=IN IP4 "                      3 0A82 000B [24] 6
   "[CRLF]c=IN IP6 "                      2 0D6A 000B [24] 6
   "[CRLF]c="                             5 0A82 0004 [24] 6
   "[CRLF]b="                             3 0AAE 0004 [24] 6
   "[CRLF]t="                             2 0D0B 0004 [24] 6
   "[CRLF]t=0 0"                          2 0D0B 0007 [32] 5
   "[CRLF]r="                             4 0916 0004 [24] 6
   "[CRLF]z="                             4 090A 0004 [24] 6
   "[CRLF]k=clear:"                       4 0823 000A [24] 6
   "[CRLF]k=base64:"                      4 07E3 000B [24] 6
   "[CRLF]k=uri:"                         4 08A0 0008 [24] 6
   "[CRLF]k=prompt:"                      4 06C9 000B [24] 6
   "[CRLF]k="                             5 06C9 0004 [24] 6
   "[CRLF]a=cat:"                         4 08C0 0008 [24] 6
   "[CRLF]a=keywds:"                      4 07F9 000B [24] 6
   "[CRLF]a=tool:"                        4 087F 0009 [24] 6
   "[CRLF]a=ptime:"                       4 0819 000A [24] 6
   "[CRLF]a=maxptime:"                    4 0753 000D [24] 6
   "[CRLF]a=rtpmap:"                      2 0DAB 000B [24] 6, [32] 5
   "[CRLF]a=recvonly"                     3 0A5E 000C [24] 6
   "[CRLF]a=sendrecv"                     3 0AF5 000C [24] 6
   "[CRLF]a=sendonly"                     3 0A76 000C [24] 6
   "[CRLF]a=inactive"                     3 0A1D 000C [24] 6
   "[CRLF]a=orient:portrait"              4 0504 0013 [24] 6
   "[CRLF]a=orient:landscape"             4 0317 0014 [24] 6
   "[CRLF]a=orient:seascape"              4 060C 0013 [24] 6



Garcia et al.                                                  [Page 26]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "[CRLF]a=type:broadcast"               4 057A 0012 [24] 6
   "[CRLF]a=type:meeting"                 4 06B9 0010 [24] 6
   "[CRLF]a=type:moderated"               4 064D 0012 [24] 6
   "[CRLF]a=type:test"                    4 06AA 000D [24] 6
   "[CRLF]a=type:H.332"                   4 095C 000E [24] 6
   "[CRLF]a=type:recvonly"                4 0679 0011 [24] 6
   "[CRLF]a=charset:"                     4 07B0 000C [24] 6
   "[CRLF]a=sdplang:"                     4 07A4 000C [24] 6
   "[CRLF]a=lang:"                        4 0888 0009 [24] 6
   "[CRLF]a=framerate:"                   4 0730 000E [24] 6
   "[CRLF]a=quality:"                     4 078C 000C [24] 6
   "[CRLF]a=fmtp:"                        2 0DF0 0009 [24] 6
   "[CRLF]a=curr:"                        2 0E02 0009 [11] 4
   "[CRLF]a=des:"                         2 0E24 0008 [11] 4
   "[CRLF]a=conf:"                        2 0E0B 0009 [11] 4
   "[CRLF]a=mid:"                         4 0898 0008 [26] 3
   "[CRLF]a=group:"                       4 080F 000A [26] 3
   "[CRLF]a=key-mgmt:MIKEY"               4 0330 0012 [28] 2.1,
                                            [29] 6
   "[CRLF]a=key-mgmt:"                    4 0330 000D [28] 2.1
   "[CRLF]a="                             5 0317 0004 [24] 6
   "[CRLF]m=audio "                       2 0DD7 000A [24] 6
   "[CRLF]m=video "                       2 0DE1 000A [24] 6
   "[CRLF]m=application "                 4 05C7 0010 [24] 6
   "[CRLF]m=data "                        4 0864 0009 [24] 6
   "[CRLF]m=control "                     4 0798 000C [24] 6
   "[CRLF]m="                             5 05C7 0004 [24] 6
   "AS "                                  3 0AB2 0003 [24] 6
   "CT "                                  3 0AB5 0003 [24] 6
   "RTP/AVP "                             2 0DA3 0008 [24] A
   "RTP/SAVP "                            3 0A29 0009 [30] 12
   "RTP/AVPF "                            3 0A32 0009 [31] 4.1
   "udp"                                  4 0A3B 0003 [2] 25.1,
                                            [24] A, [2] 25.1, [24] A
   "0.0.0.0"                              4 0D11 0007 [24] A
   "qos"                                  2 0E58 0003 [11] 4
   "mandatory"                            2 0BE4 0009 [11] 4
   "optional"                             2 0D00 0008 [2] 20.11,
                                            [11] 4, [2] 20.11, [11] 4
   "none"                                 2 0E20 0004 [34] 4.2,
                                            [11] 4
   "failure"                              4 0C82 0007 [11] 4
   "unknown"                              4 0632 0007 [11] 4
   "e2e"                                  2 0C08 0003 [11] 4
   "local"                                2 0BD9 0005 [11] 4
   "remote"                               2 0C87 0006 [11] 4
   "send"                                 2 0A7A 0004 [11] 4
   "recv"                                 2 0682 0004 [11] 4
   "sendrecv"                             2 0AF9 0008 [11] 4
   "AMR"                                  2 0DA1 0003 [25] 8
   "octet-align="                         4 0B04 000C [25] 8



Garcia et al.                                                  [Page 27]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

   "mode-set="                            4 0876 0009 [25] 8
   "mode-change-period="                  4 061F 0013 [25] 8
   "mode-change-neighbor="                4 05B2 0015 [25] 8
   "crc="                                 4 0912 0004 [25] 8
   "robust-sorting="                      4 01DE 000F [25] 8
   "interleaving="                        4 0473 000D [25] 8
   "channels="                            4 0777 0009 [25] 8
   "octet-align"                          4 0B04 000B [25] 8
   "telephone-event"                      4 0169 000F [27] 3.3, 6.1
   "events"                               4 0173 0006 [27] 6.1
   "rate"                                 4 065A 0004 [27] 6.1, 6.2
   "tone"                                 4 03F6 0004 [27] 6.2


        Table B.1: SDP input strings for the SIP/SDP dictionary







































Garcia et al.                                                  [Page 28]


INTERNET-DRAFT  The static SIP/SDP dictionary for SigComp       May 2002

Full Copyright Statement

   Copyright (C) The Internet Society (2002).  All Rights Reserved.
   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works. However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.  The limited permissions granted above are perpetual and
   will not be revoked by the Internet Society or its successors or
   assigns.  This document and the information contained herein is
   provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE
   INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF
   THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE."

Expiration Date

   This memo is filed as <draft-ietf-sipping-sigcomp-sip-
   dictionary-02.txt> and expires November 2002.


























Garcia et al.                                                  [Page 29]