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A Taxonomy of Session Initiation Protocol (SIP) Back-to-Back User Agents

Document type: Expired Internet-Draft (individual)
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Last updated: 2013-04-25 (latest revision 2012-10-22)
Intended RFC status: Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


There are numerous types of SIP Back-to-Back User Agents (B2BUAs), performing different roles in different ways. This document identifies several common B2BUA roles, in order to provide taxonomy other documents can use and reference.


Hadriel Kaplan <>

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)