[SR-Users] sipp to kamailio doesn't match ACK

[Alex Balashov]

1) AFAIK, the Record-Route/Route headers are used by TM for maintaining 
transaction state, unless you are relying on the 'dialog' module's "fast 
matching" cookies, which are identifiers that get placed as a URI 
parameter into the Record-Route header so that it is not necessary to 
match the message by more conventional means (Via/branch, Call-ID, tags, 
etc.)

2) ACK is a separate transaction;  every request and reply sequence is a 
transaction.  So, if you're trying to match it to an existing INVITE 
transaction, for instance, that won't happen.

t_check_trans() has special behaviour for ACKs, depending on whether 
they're end-to-end ACKs or ACKs for negative replies to existing 
transactions:

http://www.kamailio.org/docs/modules/3.0.x/modules/tm.html#t_check_trans

Are you sure that you're using it, or its newer variant, 
t_lookup_request(), correctly?

3) You are, nevertheless, correct that the ACK should contain the RR header:

    The UAC core MUST generate an ACK request for each 2xx received from
    the transaction layer.  The header fields of the ACK are constructed
    in the same way as for any request sent within a dialog (see Section
    12) with the exception of the CSeq and the header fields related to
    authentication.

-- Alex

-- 
Alex Balashov - Principal
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