2010/6/21 Geoffrey Mina geoffreymina@gmail.com:
It doesn't appear that Kamailio is retransmitting the ACK. I would think that would be part of the TM module, but perhaps I am not using it properly. Is this possible or is there something else going on?
Are you using loose_route() in kamailio.cfg? In this case: has the destination phone a private address and kamailio is not fixing the "Contact" header of the 180/200 response from that phone?