VoIP hardware is developing fast - this is where you ask all those “how do I make my SIP Telephone, Adapter or Asterisk box work with my voip provider?” questions.
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By GoofyCyborg
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#292
Log in to the web GUI as the administrator, click on advanced then select the extension you have setup with the voip provider in question.

Scroll down and set the following:

DTMF Process AVT: Yes
DTMF Tx Method: AVT

Now save the changes by clicking on Submit All Changes.

AVT is RFC2833! :)
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