GDS3710 used as an entry phone & vehicle gate controller, CCTV at this location.
Users can answer the call and open the door or dial into the controller and dial the code to open it - all working fine.
Reception have a GXV3275 phone and CCTV displaying on a monitor at all times. They would like to have a simple button on the phone to open the barrier when they see a recognised vehicle (ie without the driver having to get out and press the bell).
Can someone guide me on how to add this? On an analogue system I would have just setup a speeddial number with a pause and then dial the DTMF but this doesn’t appear to be supported with SIP.