Mechanism to indicate support of features and capabilities in the Session Initiation Protocol (SIP)
draft-ietf-sipcore-proxy-feature-03

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Document Type Active Internet-Draft (sipcore WG)
Last updated 2012-06-11
Replaces draft-holmberg-sipcore-proxy-feature
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SIPCORE Working Group                                        C. Holmberg
Internet-Draft                                               I. Sedlacek
Intended status: Standards Track                                Ericsson
Expires: December 13, 2012                                     H. Kaplan
                                                             Acme Packet
                                                           June 11, 2012

   Mechanism to indicate support of features and capabilities in the
                   Session Initiation Protocol (SIP)
                draft-ietf-sipcore-proxy-feature-03.txt

Abstract

   This specification creates a new IANA registry, "Feature Cap
   Registry", for registering "feature caps", which are used by SIP
   entities not represented by the URI of the Contact header field to
   indicate support of features and capabilities, where media feature
   tags cannot be used to indicate the support.

   This specification also defines a new SIP header field, Feature-Caps,
   to convey feature caps in SIP messages.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 13, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

Holmberg, et al.        Expires December 13, 2012               [Page 1]
Internet-Draft                proxy feature                    June 2012

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Feature Caps . . . . . . . . . . . . . . . . . . . . . . . . .  4
     4.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . .  5
     4.2.  Registration Trees . . . . . . . . . . . . . . . . . . . .  5
       4.2.1.  General  . . . . . . . . . . . . . . . . . . . . . . .  5
       4.2.2.  Global Tree  . . . . . . . . . . . . . . . . . . . . .  5
       4.2.3.  Feature Cap Registration Tree  . . . . . . . . . . . .  6
     4.3.  Registration Template  . . . . . . . . . . . . . . . . . .  6
     4.4.  Feature Cap Specification Requirements . . . . . . . . . .  8
       4.4.1.  General  . . . . . . . . . . . . . . . . . . . . . . .  8
       4.4.2.  Overall Description  . . . . . . . . . . . . . . . . .  8
       4.4.3.  Feature Cap Values . . . . . . . . . . . . . . . . . .  8
       4.4.4.  Usage Restrictions . . . . . . . . . . . . . . . . . .  9
       4.4.5.  Examples . . . . . . . . . . . . . . . . . . . . . . .  9
   5.  Feature-Caps Header Field  . . . . . . . . . . . . . . . . . .  9
     5.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . .  9
     5.2.  User Agent and Proxy Behavior  . . . . . . . . . . . . . . 10
       5.2.1.  General  . . . . . . . . . . . . . . . . . . . . . . . 10
       5.2.2.  B2BUA Behavior . . . . . . . . . . . . . . . . . . . . 10
       5.2.3.  Registrar Behavior . . . . . . . . . . . . . . . . . . 11
       5.2.4.  Proxy behavior . . . . . . . . . . . . . . . . . . . . 11
     5.3.  SIP Message Type and Response Code Semantics . . . . . . . 11
       5.3.1.  General  . . . . . . . . . . . . . . . . . . . . . . . 11
       5.3.2.  SIP Dialog . . . . . . . . . . . . . . . . . . . . . . 12
       5.3.3.  SIP Registration (REGISTER)  . . . . . . . . . . . . . 12
       5.3.4.  SIP Stand-Alone Transactions . . . . . . . . . . . . . 13
   6.  Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     6.1.  General  . . . . . . . . . . . . . . . . . . . . . . . . . 13
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