I've run into an interesting issue today, we have a TA912 that has pots lines coming out the back of it. Some of these lines connect to various equipment that is programmed to dial 9 before the actual telephone number. Some of the lines are not. Right now we have a dual trunk configuration that has two separate dial plans, and we assign each line to its respective trunk.
This works great, except that on inbound calls there is a drop in audio (about once every 5-10 seconds). My coworker thinks that this can be attributed to our dual trunk configuration. So my question is: Is it possible to consolidate these two trunks? Is it possible that having two trunks could cause an issue like this?
I've attached an example of our configuration.
I doubt that the audio dropouts have anything to do with your dialplan.
Have you tried configuring "no vad" on the voice users? Also "no call-waiting" unless you want call waiting, as this will cause audio artifacts when a second call comes in.
The problem is most likely VAD which is voice activity detection. It causes RTP to stop when the audio level drops below a threshold as a bandwidth-saving measure. You really only need it on very low-speed links and it will cause audio issues. Turn it off and give it a try. If the other end of the call has VAD enabled, turn it off there too.
I just wanted to check back in with you to see if you are still having problems. If so, feel free to respond with any additional questions you may have
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