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Re: [reSIProcate] Problem with UAC sending ACK automatically


Kovar, William (Bill) wrote:
Because even after a 200 OK is received, the call can still be rejected by the 
far end... i.e. Cust hangs up before ACK is sent.

Right. But even in these cases, you need to send an ACK. It's not reasonable (or compliant) to decide to withhold the ACK as an indication that the call setup has failed. Under those circumstances, you need to send an ACK followed immediately by a BYE.

I reiterate once more that an ACK without an SDP body is a transport-level consideration and must, must, must not be of interest to the application. If it is, you've done something wrong with your design.


/a