in attach the log folder of a test of several calls, where on the first 3 or 4 calls everything works fine also a ZRTP key is estabilished, and after these first calls it starts to get the ICE Fail error, the calls has a pause from each other only of few seconds, so it is on the same session.
Now, the scenario is a standard ADSL with a Double NAT (Nat from Modem/router adsl and Nat again from a Wifi Router) and the other party on a restricted port NAT from a UMTS provider.
I've enabled Jingle Node Relay and autodiscover.
Hope the log can help
log.zip (71 KB)