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I'm running the 3CX client version 22.214.171.1246 on iOS 10.3.3 on an iPhone 6. When I am away from my desk, I use the 3CX client to ring...
i have 3cx v15.5 (V15.5.6354) installed.
On one iphone 7 i got this message:
We have detected an old and unsupported version of 3cx phone...