VitalPBX Version Voiptel Starter 4.2.0-4 PBX Engine 18.26.0-1
VitalPBX Connect Anderoid Version 1.9 build 2154251,CI191656
The issue is when the device is open with the APP open in the foreground the app works fine when the app is minimised or closed or the screen is locked, the App will not accept the incomming Call and is showing unregistered.
I have allowed Ports 3500-3501 in the firewall and nothing is blocked in the Blacklist IP Addresses,
All setting in the PHones Anderoid and IOS have Backbround refresh enabled.