I-D ACTION:draft-marjou-sipping-b2bua-00.txt

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	Title		: Requirements for a Session Initiation Protocol (SIP) Transparent Back-To-Back User-Agent (B2BUA)
	Author(s)	: X. Marjou
	Filename	: draft-marjou-sipping-b2bua-00.txt
	Pages		: 10
	Date		: 2007-2-8
	

   A SIP Back-To-Back User Agent (B2BUA) refers to the concatenation of
   a SIP User Agent Client (UAC) and a SIP User Agent Server (UAS).  A
   transparent B2BUA is a particular type of B2BUA that forwards SIP
   messages in a SIP proxy-like way, and that also benefits from some
   features of a User Agent (UA) element.  This document recommends best
   current practices for the implementation of such a transparent B2BUA.   Developing transparent B2BUAs that meet this set of requirements will
   greatly increase the likelihood that SIP applications will function
   properly.




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