> what is the difference between B2BUA and proxy sever?
RFC 3261 section 6:
"Back-to-Back User Agent: A back-to-back user agent (B2BUA) is a
logical entity that receives a request and processes it as a
user agent server (UAS). In order to determine how the request
should be answered, it acts as a user agent client (UAC) and
generates requests. Unlike a proxy server, it maintains dialog
state and must participate in all requests sent on the dialogs
it has established. Since it is a concatenation of a UAC and
UAS, no explicit definitions are needed for its behavior."
RFC 7092:
"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)."
More details concerning B2BUAs can found in RFC 7092 and RFC 3725.
Straw and insipid are two B2BUA related working groups.
http://tools.ietf.org/wg/straw/
http://tools.ietf.org/wg/insipid/
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