Sip Trunks DTMF

[truckola]

vMCD 4.2 SP2 pr1, vMAS 3.0 SP1, 125 sip trunks. Calls come in and go to call director mail boxes. Sometimes the digits for selections are not heard and the inbound call times out to a default in the call director mail box. Since the Nupoint in the vMas has no dsp resources the vMCD does the interpretation of the tones and sends the NuPoint its results (2 pressed on channel #x). I assume the vMCD listens to the Sip gateway and the Nupoint conversation to do this. I also assume that this is some sort of conference call and if so how many concurrent calls can be monitored?

 

[LoopyLou]

I believe that once a SIP trunk is connected to the vMAS based voicemail, the vMCD is no longer involved in the call and therefore is not "intercepting" the tones from the caller and sending them to the voicemail. This is the same as if a call is made from an internal IP phone to the Nupoint. The vMCD is not sending DTMF to the Nupoint when the IP phone user is sending digits to play ( for example ) a message.

Maybe I am incorrect in my thinking but I believe this is the case.

I'd tell you a UDP joke but I'm afraid you won't get it. TCP jokes are the best because you always get them.

 

[Supernova99]

Make sure the SIP trunks support RFC2833 (DTMF Signalling over RTP)

Share what you know - Learn what you don't

 

[IrwinMFletcher]

Note that vMCD only supports RFC DTMF, not true in-band tone detection.

Also note that even if that is negotiated, there is nothing stopping the SIP trunk from just sending in-band digits even though you've requested RFC.