[Search] [txt|pdf|bibtex] [Tracker] [WG] [Email] [Diff1] [Diff2] [Nits]

Versions: 00 01 02 rfc3968                                              
Internet Engineering Task Force                                   SIP WG
Internet Draft                                              G. Camarillo
November 24, 2003
Expires: May 2004

          The Internet Assigned Number Authority Header Field
         Parameter Registry for the Session Initiation Protocol


   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-

   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 to cite them other than as "work in progress".

   The list of current Internet-Drafts can be accessed at

   To view the list Internet-Draft Shadow Directories, see


   This document creates an IANA registry for SIP header field
   parameters. It also lists the already existing parameters to be used
   as initial values for that registry.

G. Camarillo                                                  [Page 1]

Internet Draft                    SIP                  November 24, 2003

                           Table of Contents

   1          Introduction ........................................    3
   2          Terminology .........................................    3
   3          Use of the Registry .................................    3
   4          IANA Considerations .................................    3
   4.1        Header Field Parameters Sub-Registry ................    4
   4.2        Registration Policy for SIP Header Field
              Parameters ..........................................    4
   5          Security Considerations .............................    4
   6          Acknowledgements ....................................    4
   7          Authors' Addresses ..................................    4
   8          Normative References ................................    4
   9          Informative References ..............................    5

G. Camarillo                                                  [Page 2]

Internet Draft                    SIP                  November 24, 2003

1 Introduction

   RFC3261 [1] allows new header field parameters to be defined.
   However, RFC3261 omitted an IANA registry for them. This document
   creates such a registry.

2 Terminology

   In this document, the key words "MUST", "MUST NOT", "REQUIRED",
   and "OPTIONAL" are to be interpreted as described in RFC 2119 [2] and
   indicate requirement levels for compliant SIP implementations.

3 Use of the Registry

   SIP header field parameters MUST be documented in an RFC in order to
   be registered by IANA. This documentation MUST fully explain the
   syntax, intended usage and semantics of the parameter. The intent of
   this requirement is to assure inetroperability between independent
   implementations, and to prevent accidental namespace collisions
   between implementations of dissimialr features.

   RFCs defining SIP header field parameters MUST register them with
   IANA as described below.

   Registered SIP header field parameters are to be considered "reserved
   words". In order to preserve interoperability, registered parameters
   MUST be used in a manner consistent with that described in their
   defining RFC. Implementations MUST NOT utilize "private" or "locally
   defined" SIP header field parameters that conflict with registered

        Note that although unregistered SIP header field parameters
        may be used in implementations, developers are cautioned
        that usage of such parameters is risky. New SIP header
        field parameters may be registered at any time, and there
        is no assurance that these new registered URI parameters
        will not conflict with unregistered parameters currently in

4 IANA Considerations

   Section 27 of RFC 3261 [1] creates an IANA registry for method names,
   header field names, warning codes, status codes, and option tags.
   This specification instructs the IANA to create a new sub-registry
   under http://www.iana.org/assignments/sip-parameters:

        o Header Field Parameters

G. Camarillo                                                  [Page 3]

Internet Draft                    SIP                  November 24, 2003

4.1 Header Field Parameters Sub-Registry

   The majority of the SIP header fields can be extended by defining new
   parameters. New SIP header field parameters are registered by the
   IANA. When registering a new parameter for a header field, the
   following information MUST be provided.

        o Header field in which the parameter can appear.

        o Name of the parameter.

        o A reference to the RFC were the parameter is defined.

   Parameters that can appear in different header fields MAY have the
   same name. However, parameters that can appear in the same header
   field MUST have different names.

   Table 1 contains the initial values for this sub-registry.

4.2 Registration Policy for SIP Header Field Parameters

   As per the terminology in RFC 2434 [3], the registration policy for
   SIP header field parameters shall be "Specification Required".

   For the purposes of this registry, the parameter for which IANA
   registration is requested MUST be defined by an RFC. There is no
   requirement that this RFC be standards-track.

5 Security Considerations

   There are no security considerations associated to this document.

6 Acknowledgements

   Jonathan Rosenberg, Henning Schulzrinne, Rohan Mahy, Dean Willis, Aki
   Niemi, and Bill Marshall provided useful comments.

7 Authors' Addresses

   Gonzalo Camarillo
   Advanced Signalling Research Lab.
   FIN-02420 Jorvas
   electronic mail:  Gonzalo.Camarillo@ericsson.com

8 Normative References

G. Camarillo                                                  [Page 4]

Internet Draft                    SIP                  November 24, 2003

   [1] J. Rosenberg, H. Schulzrinne, G. Camarillo, A. R. Johnston, J.
   Peterson, R. Sparks, M. Handley, and E. Schooler, "SIP: session
   initiation protocol," RFC 3261, Internet Engineering Task Force, June

   [2] S. Bradner, "Key words for use in RFCs to indicate requirement
   levels," RFC 2119, Internet Engineering Task Force, Mar. 1997.

   [3] T. Narten and H. Alvestrand, "Guidelines for writing an IANA
   considerations section in RFCs," RFC 2434, Internet Engineering Task
   Force, Oct. 1998.

9 Informative References

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights. Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11. Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard. Please address the information to the IETF Executive

   Full Copyright Statement

   Copyright (c) The Internet Society (2003). 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

G. Camarillo                                                  [Page 5]

Internet Draft                    SIP                  November 24, 2003

       Header Field                   Parameter Name     Reference
       Accept                         q                  RFC 3261
       Accept-Encoding                q                  RFC 3261
       Accept-Language                q                  RFC 3261
       Authorization                  algorithm          RFC 3261
       Authorization                  cnonce             RFC 3261
       Authorization                  nc                 RFC 3261
       Authorization                  nonce              RFC 3261
       Authorization                  opaque             RFC 3261
       Authorization                  qop                RFC 3261
       Authorization                  realm              RFC 3261
       Authorization                  response           RFC 3261
       Authorization                  uri                RFC 3261
       Authorization                  username           RFC 3261
       Authentication-Info            cnonce             RFC 3261
       Authentication-Info            nc                 RFC 3261
       Authentication-Info            nextnonce          RFC 3261
       Authentication-Info            qop                RFC 3261
       Authentication-Info            rspauth            RFC 3261
       Call-Info                      purpose            RFC 3261
       Contact                        expires            RFC 3261
       Contact                        q                  RFC 3261
       Content-Disposition            handling           RFC 3261
       Event                          id                 RFC 3265
       From                           tag                RFC 3261
       P-Charging-Function-Addresses  ccf                RFC 3455
       P-Charging-Function-Addresses  ecf                RFC 3455
       P-Charging-Vector              icid-value         RFC 3455
       P-Charging-Vector              icid-generated-at  RFC 3455
       P-Charging-Vector              orig-ioi           RFC 3455
       P-Charging-Vector              term-ioi           RFC 3455
       P-DCS-Billing-Info             called             RFC 3603
       P-DCS-Billing-Info             calling            RFC 3603
       P-DCS-Billing-Info             charge             RFC 3603
       P-DCS-Billing-Info             locroute           RFC 3603
       P-DCS-Billing-Info             rksgroup           RFC 3603
       P-DCS-Billing-Info             routing            RFC 3603
       P-DCS-LAES                     content            RFC 3603
       P-DCS-LAES                     key                RFC 3603
       P-DCS-Redirect                 count              RFC 3603
       P-DCS-Redirect                 redirector-uri     RFC 3603
       Proxy-Authenticate             algorithm          RFC 3261
       Proxy-Authenticate             domain             RFC 3261
       Proxy-Authenticate             nonce              RFC 3261
       Proxy-Authenticate             opaque             RFC 3261
       Proxy-Authenticate             qop                RFC 3261
       Proxy-Authenticate             realm              RFC 3261

G. Camarillo                                                  [Page 6]

Internet Draft                    SIP                  November 24, 2003

       Reason                         text               RFC 3326
       Retry-After                    duration           RFC 3261
       Security-Client                alg                RFC 3329
       Security-Client                ealg               RFC 3329
       Security-Client                d-alg              RFC 3329
       Security-Client                d-qop              RFC 3329
       Security-Client                d-ver              RFC 3329
       Security-Client                mod                RFC 3329
       Security-Client                port1              RFC 3329
       Security-Client                port2              RFC 3329
       Security-Client                prot               RFC 3329
       Security-Client                q                  RFC 3329
       Security-Client                spi                RFC 3329
       Security-Server                alg                RFC 3329
       Security-Server                ealg               RFC 3329
       Security-Server                d-alg              RFC 3329
       Security-Server                d-qop              RFC 3329
       Security-Server                d-ver              RFC 3329
       Security-Server                mod                RFC 3329
       Security-Server                port1              RFC 3329
       Security-Server                port2              RFC 3329
       Security-Server                prot               RFC 3329
       Security-Server                q                  RFC 3329
       Security-Server                spi                RFC 3329
       Security-Verify                alg                RFC 3329
       Security-Verify                ealg               RFC 3329
       Security-Verify                d-alg              RFC 3329
       Security-Verify                d-qop              RFC 3329
       Security-Verify                d-ver              RFC 3329
       Security-Verify                mod                RFC 3329
       Security-Verify                port1              RFC 3329
       Security-Verify                port2              RFC 3329
       Security-Verify                prot               RFC 3329
       Security-Verify                q                  RFC 3329
       Security-Verify                spi                RFC 3329
       Subscription-State             expires            RFC 3265
       Subscription-State             reason             RFC 3265
       Subscription-State             retry-after        RFC 3265
       To                             tag                RFC 3261
       Via                            branch             RFC 3261
       Via                            comp               RFC 3486
       Via                            maddr              RFC 3261
       Via                            received           RFC 3261
       Via                            rport              RFC 3581
       Via                            ttl                RFC 3261
       WWW-Authenticate               algorithm          RFC 3261
       WWW-Authenticate               domain             RFC 3261
       WWW-Authenticate               nonce              RFC 3261
       WWW-Authenticate               opaque             RFC 3261
       WWW-Authenticate               qop                RFC 3261
       WWW-Authenticate               realm              RFC 3261

G. Camarillo                                                  [Page 7]

Internet Draft                    SIP                  November 24, 2003

   Table 1: IANA SIP header field parameter sub-registry

   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

   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

G. Camarillo                                                  [Page 8]