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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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