An Extension to the Session Initiation Protocol (SIP) for Request History Information
RFC 4244
| Document | Type |
RFC - Proposed Standard
(November 2005; Errata)
Obsoleted by RFC 7044
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 4244 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Allison Mankin | ||
| Send notices to | rohan@ekabal.com | ||
Network Working Group M. Barnes, Ed.
Request for Comments: 4244 Nortel
Category: Standards Track November 2005
An Extension to the Session Initiation Protocol (SIP)
for Request History Information
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This document defines a standard mechanism for capturing the history
information associated with a Session Initiation Protocol (SIP)
request. This capability enables many enhanced services by providing
the information as to how and why a call arrives at a specific
application or user. This document defines a new optional SIP
header, History-Info, for capturing the history information in
requests.
Table of Contents
1. Introduction ....................................................2
1.1. Overview ...................................................2
1.2. Conventions Used in This Document ..........................3
1.3. Background: Why define a Generic "Request History"
capability? ................................................3
2. "Request History" Requirements ..................................4
2.1. Security Requirements ......................................6
2.2. Privacy Requirements .......................................7
3. Request History Information Description .........................7
3.1. Optionality of History-Info ................................8
3.2. Securing History-Info ......................................8
3.3. Ensuring the Privacy of History-Info .......................9
4. Request History Information Protocol Details ....................9
4.1. Protocol Structure of History-Info ........................10
4.2. Protocol Examples .........................................11
4.3. Protocol Usage ............................................12
Barnes Standards Track [Page 1]
RFC 4244 SIP Request History Information November 2005
4.3.1. User Agent Client (UAC) Behavior ...................12
4.3.2. User Agent Server (UAS) Behavior ...................13
4.3.3. Proxy Behavior .....................................13
4.3.4. Redirect Server Behavior ...........................18
4.4. Security for History-Info .................................18
4.5. Example Applications Using History-Info ...................19
4.5.1. Example with Privacy Header for Entire
Request at Proxy2 ..................................21
4.5.2. Example with Privacy Header for Specific
URI (UA4) at Proxy2 ................................22
5. Application Considerations .....................................24
6. Security Considerations ........................................25
7. IANA Considerations ............................................25
7.1. Registration of New SIP History-Info Header ...............25
7.2. Registration of "history" for SIP Privacy Header ..........26
8. Normative References ...........................................26
9. Informative References .........................................26
10. Acknowledgements ..............................................26
11. Contributors' Addresses .......................................27
Appendix. Example Scenarios........................................28
Appendix A. Sequentially forking (History-Info in Response).....28
Appendix B. Voicemail...........................................34
Appendix C. Automatic Call Distribution Example.................39
Appendix D. Session via Redirect and Proxy Servers..............41
1. Introduction
1.1. Overview
Many services that SIP is anticipated to support require the ability
to determine why and how the call arrived at a specific application.
Examples of such services include (but are not limited to) sessions
initiated to call centers via "click to talk" SIP Uniform Resource
Locators (URLs) on a web page, "call history/logging" style services
within intelligent "call management" software for SIP User Agents
(UAs), and calls to voicemail servers. Although SIP implicitly
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