Hi Ssergey,
the ACK seem OK, but the R-URI does not contain the "sip.instance" parameter defined in the 200 OK's Contact. Usually all contact parameter should be preserved when constructing the ACK R-URI.
Does your server receive the ACK, but it is not able to forward it back to the callee (if yes, do you see any ERROR in the logs) ?
Or it just don't receive the ACK at all?

Daniel





On 05/14/2018 08:39 PM, Sergey Safarov wrote:
Hello
I have a call with not passed ACK by Kamailio. http://prntscr.com/jhtobo
Same behaviour i looked before when SIP endpoint contact string is wrong
In this call look as contact string correct is correct (packets 7 and 8) and i not understand why ACK (packet 9) not passed to callee.

Could you help me understand this.

PCAP file is create using homer tracer and TCP transport packets is stored as UDP.
 
Sergey


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