Peter Dunkley writes:
The STUN in outbound is a limited subset of STUN (Binding Request, Binding Response, and Binding Error Response, with no attributes except XOR-MAPPED-ADDRESS). This is described in RFC 5626 section 8. I am not expert in STUN, but as the attributes for authentication are not used for STUN in SIP outbound, I don't think there is a multi-domain problem.
yes, i checked that too and in outbound rfc5626, a subset of stun is used as a keepalive mechanism only.
I did some experimentation with http://turnserver.sourceforge.net/ recently for ICE/WebRTC testing, and this seems promissing.
thanks for the pointer. i was testing with restund from baresip project http://www.creytiv.com/baresip.html.
-- juha