Hi All,
I would like to know whether a B2BUA can insert the SIP Methods it
support in the Allow header, when a SIP call is made between two UAs through
the B2BUA.
If yes, then I have query on the following call flow:
UAC ---- B2BUA ---- UAS.
Say, UAC and B2BUA support UPDATE method. And UAS does not support
UPDATE method.
If an UPDATE request for codec change is received from UAC within an
early dialog, then what should be the Error response from B2BUA? Here, B2BUA
is aware that UAS does not support UPDATE method from the reliable
provisional response. So, it should not forward the UPDATE request to the
UAS.
Thanks,
Jagan
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