I have the 3cx iphone app installed on my iphone and ipad with the latest operating software and connect to our 3cx PBX system within the office network and both work fine... for a bit... then for no apparent reason, the app will unregister itself for a period of time and declare itself 'Not Registered', then after a while it will automatically re register itself. There's clearly a setting somewhere that makes it time out. Bria does a similar thing on the ipad or iphone, whereas the desktop versions of both work absolutely fine. What am i missing - i've spent hours on this now and would be extremely grateful for any help. Surely I am not the only one that experiences this?