Shared Appearances of a Session Initiation Protocol (SIP) Address of Record (AOR)
RFC 7463
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RFC - Proposed Standard
(March 2015; Errata)
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2017-01-24
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IETF
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RFC 7463 (Proposed Standard)
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Robert Sparks
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Shida Schubert (shida@ntt-at.com) is the document shepherd.
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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)
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 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
http://www.rfc-editor.org/info/rfc7463.
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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 5
3. Usage Scenarios . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Executive/Assistant Arrangement . . . . . . . . . . . . . 5
3.2. Call Group . . . . . . . . . . . . . . . . . . . . . . . 5
3.3. Single Line Extension . . . . . . . . . . . . . . . . . . 6
3.4. Changing UAs . . . . . . . . . . . . . . . . . . . . . . 6
4. Requirements and Implementation . . . . . . . . . . . . . . . 6
4.1. Requirements . . . . . . . . . . . . . . . . . . . . . . 6
4.2. Implementation . . . . . . . . . . . . . . . . . . . . . 8
5. Normative Description . . . . . . . . . . . . . . . . . . . . 10
5.1. Elements . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2. Shared Appearance Dialog Package Extensions . . . . . . . 11
5.2.1. The <appearance> Element . . . . . . . . . . . . . . 11
5.2.2. The <exclusive> Element . . . . . . . . . . . . . . . 12
5.2.3. The <joined-dialog> Element . . . . . . . . . . . . . 12
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