Hi,

I wanted to achieve the following scenario with Kamailio and Asterisk/FreeSwitch

Kamailio as a trunk for Receiving incoming calls and forward to Asterisk and Make outgoing calls. My current working setup like this

VoIP Provider -> Kamailio -> Asterisk Clusters

Where Kamailio(NAT for public) and Asterisk in the same local network, So I had to do only one thing just create the SIP trunk in Asterisk for authenticating all the Kamailio Incoming calls and making outgoing calls like this

This is IP based authentication, This is working fine since both servers are in the same local network or having the public IP's

What I want is, I want to register the Kamailio Trunk in an asterisk with Username Password authentication, 

My current setup for making that, 

VoIP Provider -> Kamailio(Public) -> Asterisk(Randomly Changing Public IP, Broadband Connection)

I want to register Kamailio SIP in asterisk trunk so that I can forward the incoming calls to asterisk via SIP extension

Let me know if anyone doesn't understand my concern