Sending DTMF tones using UCMA 4.0 and ToneController

Hi,

I am currently trying to send some DTMF tones through UCMA 4.0 and the ToneController class.

It seems to be quite easy with ToneController.Send(5) or Send(5, 100) to set the volume, but I can't hear any sound on the output.

Is it a normal behaviour and if it is the case, is there any way to produce a sound with ToneController ?