I have setup VitalPBX, with the vps script verry nice…, with a Kamailio in front.
Phones register on the Kamailio and then kamailio forwards the registration to VitalPBX.
Calls work, audio is flowing.
No problems here.
When a phone calls, the invite gets challenged by Kamailio, after that the call is routed to the VitalPBX, the PBX also challenges the invite. That is what I want to prevent. Authentication is already done by Kamailo, no need for Vital to do that again.
When I use a vanilla Asterisk, I just configure a trunk like this.