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RFC 7463
Title: Shared Appearances of a Session
Initiation Protocol (SIP) Address of Record (AOR)
Author: A. Johnston, Ed.,
M. Soroushnejad, Ed.,
V. Venkataramanan
Status: Standards Track
Stream: IETF
Date: March 2015
Mailbox: alan.b.johnston@gmail.com,
msoroush@gmail.com,
vvenkatar@gmail.com
Pages: 72
Characters: 171979
Updates: RFC 3261, RFC 4235
I-D Tag: draft-ietf-bliss-shared-appearances-15.txt
URL: https://www.rfc-editor.org/info/rfc7463
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.
This document is a product of the Basic Level of Interoperability for SIP Services Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
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