Kamailio + Asterisk behind NAT

Asterisk Asterisk Integration
1

The setup is

Kamailio public IP and Asterisk behind having a private IP.

the problem is with some of trunks and outgoing calls.
As you can imagine the SDP has a local ip address of the asterisk machine. Usually in those cases most trunks just send the replay to the ip address the sdp came from. But some dont and i dont get any RTP. so no audio from trunk.

There are two possible solutions, and i would like some of your input.

First, i setup the rtp range in asterisk, and enter the setting for outgoing media address, then on the public ip i just forward that range to the private address of asterisk.

The other is to proxy outgoing ( to the world ) calls to Kamailio and then have the trunks setup there.

2

What input are you looking for? Many people do this in Asterisk itself by configuring and port forwarding as you’ve mentioned, so that is certainly a viable approach.

3

mainly from experience is that ok solution.
i have done that also and it works for now.
for more boxes every asterisk has its own rtp range and the ports are forwarded to different machines.