Well it will be hard to tell what else is not working unless we get past step 1 which is being able to dial in and then dial out so yes, the DTMF thing seems to be the biggest issue.
I'd say we all need to test it:
1. from a land line (POTS) if possible
2. from a cell phone. The DTMF length setting on the phone may be set to "short" which could trigger a false sense that the voipo feature is not working.
3. test is from other voip services and note the differences in behavior.
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