Shared Appearances of a Session Initiation Protocol (SIP) Address of Record (AOR)
RFC 7463
Document | Type | RFC - Proposed Standard (March 2015; Errata) | |
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Authors | Alan Johnston , Mohsen Soroushnejad , Venkatesh Venkataramanan | ||
Last updated | 2017-01-24 | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 7463 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Robert Sparks | ||
IESG note | Shida Schubert (shida@ntt-at.com) is the document shepherd. | ||
Send notices to | (None) |
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 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 to this document. Code Components extracted from this document must 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. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. 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 5.2.4. The <replaced-dialog> Element . . . . . . . . . . . . 13 5.3. Shared Appearance User Agents . . . . . . . . . . . . . . 13Show full document text