I am integrating an E12 doorphone into an on-prem hosted smart home context.For this (and other communication purposes), I have a PBX server running to handle all calls and to run more complex logic.
This part is working perfectly with the E12.

However, my main concern is the dail out from the doorphone, which is always activated when the button is pressed.
Instead I would like to only use the action URL to my server as a trigger to:

• announce door presence through sound system (playback alert)  -> this part is no prob
• dicide if and what extension number to call, instruct door phone to dail that number
  

Ik know the HTTP API is capable, but unfortunately, the documentation is MISSING and Akuvox support is (Chineese new year?) very unresponsive!

I now use /api/call/hangup as a solution to abort the call, which is not the right approach, but I have nothing else ...
Ideally, I would be using the api to instruct the phoe to dail a specific extension.

Is there anybody that knows how to perform this specific call ?