I want to know how the CUCM will come to know DTMF is pressed in in-Band DTMF like RTP-NTE is used and when it needs to introduce MTP to extract the DTMF to send it in signal channel. Since, RTP is end to end phone communication rather CUCM doesn't come into picture. Does the other end of the phone says I need to invoke the MTP as I don't under the DTMF that came to RTP...Please explain in detail... if possible
I know out of band always sends the DTMF in signalling so, just want to make it clear...
