UCM6204 + GXP2130: DTMF disabled while second call ringing


I am trying to figure something out and hope someone else might have an answer. We have a call box that requires us to hit “0” to open a gate when the call box calls the office. If the person who answers the call box call is also getting another inbound call at the same time, it seems that they cannot hit “0” without first rejecting the inbound call.

Why are DTMF tones shut off if there is another call coming in and how to we turn them back on? We don’t want to reject the calls as the user will pick up the phone after buzzing the gate open.


Someone else has submitted a feature request on this issue.