pnshields 0 Posted September 15, 2011 Report 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 post Share on other sites
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