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An Extension to the Session Initiation Protocol (SIP) for Request History Information (RFC7044) Disclosure Number: IPCOM000234782D
Original Publication Date: 2014-Feb-01
Included in the Prior Art Database: 2014-Feb-05
Document File: 72 page(s) / 85K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Barnes: AUTHOR [+4]


Many services that SIP is anticipated to support require the ability to determine why and how a SIP request 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 provides the retarget capabilities that enable SIP requests to be routed to chosen applications, there is a need for a standard mechanism within SIP for communicating the retargeting history of the requests. This request history information allows the receiving application to obtain information about how and why the SIP request arrived at the application/user.

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Internet Engineering Task Force (IETF)                         M. Barnes Request for Comments: 7044                                       Polycom Obsoletes: 4244                                                 F. Audet Category: Standards Track                                          Skype ISSN: 2070-1721                                              S. Schubert                                                                      NTT                                                            J. van Elburg                                               Detecon International Gmbh                                                              C. Holmberg                                                                 Ericsson                                                            February 2014

        An Extension to the Session Initiation Protocol (SIP) for                       Request History Information


   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 SIP request arrives at a specific    application or user.  This document defines an optional SIP header    field, History-Info, for capturing the history information in    requests.  The document also defines SIP header field parameters for    the History-Info and Contact header fields to tag the method by which    the target of a request is determined.  In addition, this    specification defines a value for the Privacy header field that    directs the anonymization of values in the History-Info header field.    This document obsoletes RFC 4244.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Barnes, et al.           ...