hi!
try to: - look in tcpdump of your SIP traffic (use wireshark) - add logging to your kamailio.cfg
both points to understand the difference between 2 calls (good and failed).
The description that you prepared is not informative enough - to understand what is wrong (important point: kamailio is sipproxy, and does not operate with such things as "call")
try to dig more, prepare more info on the point of view of SIP and share here.
cheers
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