This question has been asked before on the list but no answer was received (http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/2013-February/015735.html).
Why doesn't, or how can I make, PJSIP send keepalive messages as SIP OPTIONS messages?
The problem I'm trying to solve is that I have systems behind a rather short-tempered NAT, which apparently does SIP detection, and the default keepalive messages sent by the standard PJSIP configuration are sent using a different mapping than the SIP mapping, and do not keep the SIP mapping open.
I've seen that pjsua_acc has a ka_transport field, but I found no documentation how to set it up and reviewing the source code didn't provide me with understanding on even whether it can be used to do what I want.
Any suggestions?
-- Oded Arbel
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