Indication of features supported by proxy
draft-ietf-sipcore-proxy-feature-01

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Document Type Active Internet-Draft (sipcore WG)
Last updated 2012-04-17
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: October 19, 2012                                      H. Kaplan
                                                             Acme Packet
                                                          April 17, 2012

               Indication of features supported by proxy
                draft-ietf-sipcore-proxy-feature-01.txt

Abstract

   This specification creates a new IANA registry, "SIP Feature Cap
   Registry", which is used to register indicators, "SIP feature caps",
   used by SIP entities to indicate support of features and
   capabilities, in cases where the Contact header field contains a URI
   that does not represent the SIP entity that wants to indicate support
   of its features and capabilities.

   This specification also defines a new SIP header field, Feature-Caps,
   that can be used by SIP entities to convey information about
   supported features and capabilities, using SIP feature caps.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 19, 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

Holmberg, et al.        Expires October 19, 2012                [Page 1]
Internet-Draft                proxy feature                   April 2012

   (http://trustee.ietf.org/license-info) in effect on the date of
   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.

Holmberg, et al.        Expires October 19, 2012                [Page 2]
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  SIP Feature Caps . . . . . . . . . . . . . . . . . . . . . . .  5
     4.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . .  5
     4.2.  Syntax . . . . . . . . . . . . . . . . . . . . . . . . . .  5
       4.2.1.  General  . . . . . . . . . . . . . . . . . . . . . . .  5
       4.2.2.  ABNF . . . . . . . . . . . . . . . . . . . . . . . . .  5
     4.3.  Registration Trees . . . . . . . . . . . . . . . . . . . .  6
       4.3.1.  General  . . . . . . . . . . . . . . . . . . . . . . .  6
       4.3.2.  Global Tree  . . . . . . . . . . . . . . . . . . . . .  6
       4.3.3.  SIP Feature Cap Registration Tree  . . . . . . . . . .  7
     4.4.  Registration Template  . . . . . . . . . . . . . . . . . .  7
     4.5.  SIP Feature Cap Specification Requirements . . . . . . . .  9
       4.5.1.  General  . . . . . . . . . . . . . . . . . . . . . . .  9
       4.5.2.  Overall Description  . . . . . . . . . . . . . . . . .  9
       4.5.3.  Feature Cap Values . . . . . . . . . . . . . . . . . .  9
       4.5.4.  Usage Restrictions . . . . . . . . . . . . . . . . . . 10
       4.5.5.  Implementation Details . . . . . . . . . . . . . . . . 10
       4.5.6.  Examples . . . . . . . . . . . . . . . . . . . . . . . 10
   5.  Feature-Caps Header Field  . . . . . . . . . . . . . . . . . . 10
     5.1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . 11
     5.2.  User Agent and Proxy Behavior  . . . . . . . . . . . . . . 11
       5.2.1.  General  . . . . . . . . . . . . . . . . . . . . . . . 11
       5.2.2.  B2BUA Behavior . . . . . . . . . . . . . . . . . . . . 12
       5.2.3.  Registrar Behavior . . . . . . . . . . . . . . . . . . 12
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