Requirements for Multiple Address of Record (AOR) Reachability Information in the Session Initiation Protocol (SIP) (RFC5947)
Original Publication Date: 2010-Sep-01
Included in the Prior Art Database: 2010-Sep-15
Internet Society Requests For Comment (RFCs)
J. Elwell: AUTHOR [+1]
The Session Initiation Protocol (SIP) [RFC3261], together with its extensions, supports multiple means of obtaining the connection information necessary to deliver out-of-dialog SIP requests to their intended targets. When a SIP proxy needs to send a request to a target address of record (AOR) within its domain, it can use a location service to obtain the registered Contact Universal Resource Identifiers (URIs), together with any associated path information [RFC3327], and build a route set to reach each target user agent (UA). The SIP REGISTER method can be used to register Contact URIs and path information. SIP-outbound [RFC5626] enhances this mechanism to cater to UAs behind Network Address Translators (NATs) and firewalls. When an entity needs to send a request to a target for which it is not authoritative, the entity can follow [RFC3263] procedures for using the Domain Name System (DNS) to obtain the next- hop connection information.
Internet Engineering Task Force (IETF) J. Elwell Request for Comments: 5947 Siemens Enterprise Communications Category: Informational H. Kaplan ISSN: 2070-1721 Acme Packet September 2010
Requirements for Multiple Address of Record (AOR) Reachability Information in the Session Initiation Protocol (SIP)
This document states requirements for a standardized SIP registration mechanism for multiple addresses of record (AORs), the mechanism being suitable for deployment by SIP service providers on a large scale in support of small to medium sized Private Branch Exchanges (PBXs). The requirements are for a solution that can, as a minimum, support AORs based on E.164 numbers.
Status of This Memo
This document is not an Internet Standards Track specification; it is published for informational purposes.
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). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see 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/rfc5947.
Kaplan Informational [Page 1]
RFC 5947 Multiple AOR reachability in SIP September 2010
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Table of Contents
1. Introduction ....................................................3
2. Terminology .....................................................3
3. Problem Statement ...............................................4