Im using this:
Registrar/Proxy Hostname or IP: i2telecom.com
Outbound Proxy Hostname or IP: 206.165.50.116
both Ports: 5060
Stun server: blank
user: 1xxxxxxx (my number)
and my password
when i use this exact configuration on the sjphone, it works, and when conecting on the 3cx it states:
ClientRegs:nFailure [CM113006] Registration of sip:[email protected] has failed; reason=SERVICE UNAVAILABLE