Hi,
Are we required to maintain backward compatibly with RFC 2543 when
dialog-matching? I.e. for example, if we don't find a from tag in a request,
can we just compare the whole from field instead?
I am looking through 3261, and it does mention maintaining some backwards
compatibility with 2543 (i.e. an UAS should be prepared to accept a request
without a From tag). But, I didn't come across anything regarding backward
compatibly in dialog matching (which seems kind of weird, since you can accept
requests without tags). On top of that, section 15.1.2 says
Section 15.1.2
A UAS first processes the BYE request according to the general UAS
processing described in Section 8.2. A UAS core receiving a BYE
request checks if it matches an existing dialog. If the BYE does not
match an existing dialog, the UAS core SHOULD generate a 481
(Call/Transaction Does Not Exist) response and pass that to the
server transaction.
This rule means that a BYE sent without tags by a UAC will be
rejected. This is a change from RFC 2543, which allowed BYE
without tags.
Arjun
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