Christer Holmberg writes:
> 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.
>
> We could of course say something like:
>
> "UAS, when part of a B2BUA"
according to the B2BUA definition:
Since it is a concatenation of a UAC and
UAS, no explicit definitions are needed for its behavior.
this means that there is no need to say anything special about 199
either. b2bus in terms of protocol specification, is just an uas like
any other.
-- juha
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