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Shared Appearances of a Session Initiation Protocol (SIP) Address of Record (AOR) (RFC7463) Disclosure Number: IPCOM000241084D
Original Publication Date: 2015-Mar-01
Included in the Prior Art Database: 2015-Mar-26

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Johnston: AUTHOR [+4]


The feature and functionality requirements for SIP user agents (UAs) supporting business telephony applications differ greatly from basic SIP UAs, both in terms of services and end-user experience. In

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Internet Engineering Task Force (IETF)                  A. Johnston, Ed. Request for Comments: 7463                                         Avaya Updates: 3261, 4235                                 M. Soroushnejad, Ed. Category: Standards Track                              V. Venkataramanan ISSN: 2070-1721                                   Sylantro Systems Corp.                                                               March 2015

        Shared Appearances of a Session Initiation Protocol (SIP)                         Address of Record (AOR)


   This document describes the requirements and implementation of a    group telephony feature commonly known as Bridged Line Appearance    (BLA) or Multiple Line Appearance (MLA), or Shared Call/Line    Appearance (SCA).  When implemented using the Session Initiation    Protocol (SIP), it is referred to as shared appearances of an Address    of Record (AOR) since SIP does not have the concept of lines.  This    feature is commonly offered in IP Centrex services and IP Private    Branch Exchange (IPBX) offerings and is likely to be implemented on    SIP IP telephones and SIP feature servers used in a business    environment.  This feature allows several user agents (UAs) to share    a common AOR, learn about calls placed and received by other UAs in    the group, and pick up or join calls within the group.  This document    discusses use cases, lists requirements, and defines extensions to    implement this feature.  This specification updates RFCs 3261 and    4235.

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

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the    document authors.  All rights reserved.

 Johnston, et al.             Standards Track                    [Page 1]
 RFC 7463                 SIP Shared Appearances               March 2015

    This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this...