Quote Originally Posted by MisterEd View Post
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Would changing DTMF to Inband have any other negative side effects?
Inband means the tones ride along with voice, and can be more subject to lost UDP packets. I would think its more forgiving than FAX transmissions.

If you have problems navigating interactive switchboards, you may need it switched back. That is my understanding - but I only know from what I've read on VoIP Forums ....

Out of band detects, and generates/synthesizes tones.