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Mechanism to Indicate Support of Features and Capabilities in the Session Initiation Protocol (SIP)
RFC 6809

Internet Engineering Task Force (IETF)                       C. Holmberg
Request for Comments: 6809                                   I. Sedlacek
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                                H. Kaplan
                                                             Acme Packet
                                                           November 2012

     Mechanism to Indicate Support of Features and Capabilities in
                 the Session Initiation Protocol (SIP)

Abstract

   This specification defines a new SIP header field, Feature-Caps.  The
   Feature-Caps header field conveys feature-capability indicators that
   are used to indicate support of features and capabilities for SIP
   entities that are not represented by the Uniform Resource Identifier
   (URI) of the Contact header field.

   SIP entities that are represented by the URI of the SIP Contact
   header field can convey media feature tags in the Contact header
   field to indicate support of features and capabilities.

   This specification also defines feature-capability indicators and
   creates a new IANA registry, "Proxy-Feature Feature-Capability
   Indicator Trees", for registering feature-capability indicators.

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
   http://www.rfc-editor.org/info/rfc6809.

Holmberg, et al.             Standards Track                    [Page 1]
RFC 6809                      Proxy Feature                November 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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   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 ....................................................3
   2. Conventions .....................................................4
   3. Definitions .....................................................4
   4. Feature-Caps Header Field .......................................4
      4.1. Introduction ...............................................4
      4.2. User Agent and Proxy Behavior ..............................4
           4.2.1. General .............................................4
           4.2.2. B2BUA Behavior ......................................5
           4.2.3. Registrar Behavior ..................................6
           4.2.4. Proxy Behavior ......................................6
      4.3. SIP Message Type and Response Code Semantics ...............7
           4.3.1. General .............................................7
           4.3.2. SIP Dialog ..........................................7
           4.3.3. SIP Registration (REGISTER) .........................7
           4.3.4. SIP Standalone Transactions .........................8
   5. Feature-Capability Indicators ...................................8
      5.1. Introduction ...............................................8
      5.2. Registration Trees .........................................9
           5.2.1. General .............................................9
           5.2.2. Global Tree .........................................9
           5.2.3. SIP Tree ............................................9
      5.3. Feature-Capability Indicator Specification Requirements ...10
           5.3.1. General ............................................10
           5.3.2. Overall Description ................................10
           5.3.3. Feature-Capability Indicator Values ................10
           5.3.4. Usage Restrictions .................................11
           5.3.5. Interoperability Considerations ....................11
           5.3.6. Security Considerations ............................11
           5.3.7. Examples ...........................................12

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