15.5 legacy app

App for 3CX Phone system Server Version 15.5. Will be discontinued early 2020

Use only if you are unable to update 3CX Server to Version 16

For use with Version 15.5 only

Can work on Android 6,7,8

Will have problems on Android 9

Does not work on Android 10

The proper app you should use is this:

https://play.google.com/store/apps/details?id=com.tcx.sipphone14