Hi @ChrisHenderson,
Thank you for your response. Something strange happened few minutes before I write this reply!! I opened the app, then pressed the call button on the intercom, and surprisingly the intercom rang!! Also I previously programmed a scene which turns on a light when the call button is pressed and the scene was activated, although it wasn't activated before. And more surprisingly, I tried the call button about 3 times and each time I pressed it, I received a call on my phone, but after that the call button stopped again!!
I want to clarify a point, when I say the intercom doesn't ring, I mean that even the door unit doesn't ring, not only the mobile app or touchscreen. In addition, in parallel with my post here I sent an email to the control4 support and they replied to me with some steps to make, which I did but without any change until the moment of this reply.
I have replaced the door unit for the customer with a new one which is currently working well, and I have the unit with problems at the office.
I am attaching the logs, and a screenshot of the email from control4 support.
Many thanks
navigator.log
IntercomHistory.log