I have verifed that my MG setup works and I can make calls from a fixed handset -> MG -> SIP. However, I cannot get it to work from a mobile handset. I suspect it has something to do with either the way my mobile sends DTMF or how the mobile service provider processes DTMF over mobile network. I have tried several configurations from two types of handsets Nokia and motorola (and two different providers - Airtel and vodafone) but the MG is not receiving (or recognising) the DTMF signals. Any ideas?
Switch off the key-pressed tones (if any) via phone's settings.
Test in conversation between two GSM phones if you press a key on the first phone - is DTMF heard on the other phone.
ok have tested as suggested ... yes DTMF tone is audible on the other phone
Check again program's Tools > Settings > |Advanced| that Audio In and Out are to C-Media USB ...
- Also see in Control Panel > Sound and Audio Devices > |Audio| if Default Audio devices are C-MEdia USB ...
- Also check i volumes are not too low.
Open Volume Control, Options > Properties
select Mixer device to C-Media USB ...
select "Playback"
put all ticks (marks) on "Show the following volume controls".
Press [OK]
Speaker must be on ~75%
Wave must be on 100%
Microphone must be muted (tick (mark) infron of Mute)).
Open again Options > Properties
select Mixer device to C-Media USB ...
select "Recording"
put tick (mark) infront of "Microphone" on "Show the following volume controls".
Press [OK]
Microphone level must be on ~50%
Options > Advanced Contols (if "Advanced Contols" is grayed, press Ctrl+S to make it active.)
Press [Advanced] button on the bottom.
1 AGC must have tick (mark).
Close Volume control.
If it worked via one network (as you said, your fixed network), so program is set correctly.
It might be your mobile network change something in DTMF generation which are out of DTMF standards and we can't help.