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Call gets setup but no audio

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usman

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Jul 3, 2012
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Hi, I have my SIP server setup on a remote machine. And there are following SIP phones in my local network.
1. Polycom device (IP: 192.168.4.3)
2. My iPhone having 3CX installed. (IP: 192.168.4.5)

Both devices gets registered with the SIP server fine. Call gets setup fine too when I call one from the other but I hear no idea. Audio works fine if I use another app named AdorePhone instead of 3CX but 3CX has a lot of new features so I am struggling to make it work.

Following are my profile's settings on the 3CX app:

External PBX IP: (my_remote_server_ip)
PBX Port: 5060
STUN Server: stun3.3cx.com
Local SIP Port: 5065
First RTP port: 4000
TCP Transport: OFF
NAT Helper: ON
GSM, aLaw and ulaw: ON
 
Removing STUN server has resolved the problem.

What is STUN server? Why removing it solved the problem?
 
Stun is needed when phone server not a public ip and you need remote xtensions.
 
http://en.wikipedia.org/wiki/STUN
 
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