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Discussion in '3CX Phone System - General' started by lotsu99, Dec 23, 2008.
what's type of DTMF should I used in IP-Phone ?
Inband or Outband ?? Thx
It would be best to use RFC2833 for DTMF. It is the most reliable.
The most important thing is what your voip provider support's,
the problem is that when you dont have a provider that isnt using the RFC DTMF you will have problems when 3cx is delivering audio (by default on you voip line)