My freeswitch is using public IP. I setup a gateway registering to voipstunt, and put it under internal profile. I tried to make call, and I got no RTP back from the provider... Tried treating NAT issue by changing IP address, internal IP, external IP. But no use, still getting no audio. 

Finally, I gave up play around with the internal profile and put the gateway settings under external profile. And magically, it worked. I am getting audio now. But it leads me to wonders, what's the core difference between external profile and internal profile. Even if I set the external SIP IP and exteranl RTP IP to the public IP in internal profile, I am still getting no audio. Can anyone clear the concept for me here?

by the way, I am using freeswitch 1.4 stable version. 

--
Henry Huang

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