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Outgoing calls - cannot hear


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The Phone is a Grandstream phone.


I can call the phone from my cell phone, and can hear and talk back and forth fine...

but when I try to make a call from the phone, I cannot hear the other person talking, yet they can hear me.


The fact that it works fine on receiving but not on sending makes no sense. It sounds like a firewall issue, but we are set up fine.


Any ideas?



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Look at http://wiki.pbxnsip.com/index.php/Troubles..._Trunk_Problems for trunk problems.


Also, you can look at the BYE packets send from the PBX. There you can see how many packets the PBX received. In one-way audio cases, that is very useful. If it all does not help, you can use Ethereal to see what is "truely" going on on the cable level.

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