Antonio : question : do you confirm that with 2 participant, you can make the call but NO AUDIO ?
Dele : I can make one suggestion : if you want us to help you debug more the SIP stack, you need to expose more properties
so that we can play a little but. Best is to take Jitsi sipphone, look at the settings we can adjust in a sip account + codecs, + ....
and put that in properties page.
Thanks for the job again.