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 🙂