Shared Appearances of a Session Initiation Protocol (SIP) Address of Record (AOR)
draft-ietf-bliss-shared-appearances-15

BLISS                                                   A. Johnston, Ed.
Internet-Draft                                                     Avaya
Updates: 3261, 4235 (if approved)                        M. Soroushnejad
Intended status: Standards Track                       V. Venkataramanan
Expires: July 20, 2013                             Sylantro Systems Corp
                                                        January 16, 2013

  Shared Appearances of a Session Initiation Protocol (SIP) Address of
                              Record (AOR)
                 draft-ietf-bliss-shared-appearances-15

Abstract

   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-PBX
   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 RFC3261 and RFC4235.

Status of this Memo

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   This Internet-Draft will expire on July 20, 2013.

Copyright Notice

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  Conventions used in this document  . . . . . . . . . . . . . .  6
   3.  Usage Scenarios  . . . . . . . . . . . . . . . . . . . . . . .  6
     3.1.   Executive/Assistant Arrangement . . . . . . . . . . . . .  6
     3.2.   Call Group  . . . . . . . . . . . . . . . . . . . . . . .  7
     3.3.   Single Line Extension . . . . . . . . . . . . . . . . . .  7
     3.4.   Changing UAs  . . . . . . . . . . . . . . . . . . . . . .  7
   4.  Requirements and Implementation  . . . . . . . . . . . . . . .  7
     4.1.   Requirements  . . . . . . . . . . . . . . . . . . . . . .  7
     4.2.   Implementation  . . . . . . . . . . . . . . . . . . . . .  9
   5.  Normative Description  . . . . . . . . . . . . . . . . . . . . 11