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Joined: Mar 2012
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I have a New install os7400 with sip trunking. Version 4.80. Sip trunks are registering fine outbound calls are good. After an undetermined amount of time incomming callers get a fast busy. If you make an outbound call then immediatedly make another incomming call it will ring in and work correctly for a few calls. Then after a while it stops ringing in any you have to make an outbound call again to get incomming calls to ring in. It seems like routing/firewall issue. Just can't fingure it out.

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Easy.

The firewall is blocking the incoming packets.

Port forward UDP 5060 to the MP40 card.

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That's what I thought too...Already forwarded 5060 to the processor, even tried putting processor in DMZ for a test (did not leave it in after it did not help). I am guessing I am going to have to go ahead and use wireshark, problem just surfaced today when I turned up the trunks. Thanks for the quick reply.

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In 5.2.13 for the particular SIP Carrier, set Alive Notify to Option, and then the Alive Notify Time to a time less than the firewall timeout time. Somewhere between 300 to 600 seconds is usually fine. That will send an OPTIONS request to your provider at that period, which opens the firewall ports for communications with your provider. There are generally very few reasons to port forward 5060 to your system if you do this, especially if you aren't locking it to your provider's IP.


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Ok, I will try that in the morning. Thanks for the info. I appreciate it.

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Thanks to all, the alive notify seems to have worked. I appreciate the help. :-)


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