I did some testing of Jitsi and JSCommunicator through a SIP proxy
I see that Jitsi has some of the ingredients for this (e.g. it doesn't
reboot the machine when it sees RTP/SAVPF in the SDP, some other UAs
really do respond that badly however) but it is not complete yet either.
Can anybody comment on the plans for supporting this from Jitsi? Once
it is ready I would like to publish some sample config and screenshots,
this will be really useful for people trying the new debian.org SIP service.
I can provide a sample JSCommunicator/JsSIP config that you can access
through the web to test if necessary, you can just as easily wget the
sample and run it locally if you prefer