Sending socket isn't the issue here, it's the destination address/port. The
destination can be forced by setting the outbound_proxy setting of PUA -
http://www.kamailio.org/docs/modules/4.3.x/modules/pua.html#idp15445640. This works in my
usecase but probably not in others.
The client isn't using TLS in this instance but this is the next step to implement.
Appending to the pseudo variables may work but it seems like a hack rather than a bug
fix.
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https://github.com/kamailio/kamailio/issues/509#issuecomment-184654700