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Reply To: TFO in Alcatel



I’m still to keep up with you here 🙂 Could you explain the start DTMF / stop DTMF again ? Let see if I understood correctly :

in the “start DTMF” msg, there is a list of digits, which are decoded by MSC as being tones ? And the MSC sends these tones to the remote party ?

What is the purpose of stop DTMF ?

The remote party (according to Ivann) is a GSM Modem. So those tones are sent from MSC to this modem over the TCH channel, like a typical speech frame ?

Sorry to be a little dumb here, it’s not clear to me how DTMF works 🙂