A new Request for Comments is now available in online RFC libraries.
RFC 7092
Title: A Taxonomy of Session Initiation
Protocol (SIP) Back-to-Back User Agents
Author: H. Kaplan, V. Pascual
Status: Informational
Stream: IETF
Date: December 2013
Mailbox: [email protected],
[email protected]
Pages: 10
Characters: 22085
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-straw-b2bua-taxonomy-03.txt
URL: http://www.rfc-editor.org/rfc/rfc7092.txt
In many SIP deployments, SIP entities exist in the SIP signaling path
between the originating and final terminating endpoints, which go
beyond the definition of a SIP proxy, performing functions not
defined in Standards Track RFCs. The only term for such devices
provided in RFC 3261 is for a Back-to-Back User Agent (B2BUA), which
is defined as the logical concatenation of a SIP User Agent Server
(UAS) and User Agent Client (UAC).
There are numerous types of SIP B2BUAs performing different roles in
different ways; for example, IP Private Branch Exchanges (IPBXs),
Session Border Controllers (SBCs), and Application Servers (ASs).
This document identifies several common B2BUA roles in order to
provide taxonomy other documents can use and reference.
This document is a product of the Sip Traversal Required for Applications to
Work Working Group of the IETF.
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