RE: [Sip] B2BUA & Max-Forwards

[Adam Roach <adam@dynamicsoft.com>]

> UAC(a)--->UAS(b)===[application logic here]===UAC(b)--->UAS(c)
> 
> [RRR] I like to know who has been the called party when 
> UAC(a)) sent the INVITE message? Has it been UAS(b) or UAS(c)?

I'm going to first need to clarify your question.

The question I will answer is: "If an INVITE is sent through the
network described in this diagram, what is the value of the
Request-URI when UAC(a) sends it?"

The answer is: it depends. In general, yes, it will probably be
either of UAS(b) or UAS(c).

> [RRR] If the answer is UAS(c), the question is: Why the call 
> has been routed to UAS(b) by UAC(a) in the first place?

The most obvious of several plausible answers is: UAC(a)
has UAS(b) configured as a local outbound proxy.

> [RRR] If the answer is UAS(b), probably UAC(a) does not care.

About what?

/a
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