It looks like kamailio was not able to connect to your media server. It could be the limit
of active connections, try to increase it if you have a lot of tcp connections.
Look in the code at doc/tcp_tunning.txt for hints on heavy use of tcp.
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/51#issuecomment-71913290