I have a problem with setting up DTMF mode for UCM6510. I used it for my sip trunk line with IVR. And when DTMF inband mode is set, analog (PSTN) line can call our call centre and they can press any number to redirect to agents. But mobile users can’t press any number to redirect to call centre agents.
But when DTMF mode auto is set, Mobile use can call the call center agents but PSTN line couldn’t press any keys to redirect to call centre agents. Does anyone have this experience before ? Please advise how we could fix it.