pnshields Posted September 15, 2011 Share Posted September 15, 2011 DD says the phone you are using must have DTMF? Does that mean the VOIP service or the phone you are calling in on, such as a softphone or cell phone must have DTMF? Do cell phones hace DTMF? I am with AT&T Wireless. Link to comment Share on other sites More sharing options...
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