Called number does not exist - 3CX app

[Anton Orlov]

Hi everybody,
we host 3cx on-premises, from the browser I can call but if I from 3cx Android app which is 16.3.0.81 version, every extension or external number gives out "Called number does not exist". Firewall is OK. It also happens some time that I can call from the app but after some minutes there is again this error. The problem is with every extension, not only mine. What it can be?

 

[leejor]

Is the Android App always external to the LAN? Have you run the 3CX Firewall Checker to see if any ports are not open, that should be. Have you checked the 3CX Activity Log, right after a call attempt to see if the call reached the PBX, and, any error messages associated with it?
Are there any other external extensions working correctly?

 

[Saqqara]

How did you configure the android device ?

Does *777 echo test work on the android app.

check the activity log to see activity from the extension,

check your e164 settings