I'm attempting to test 3cx Phone for android. I had started testing it a year or more ago. At that time, after installation to the phone, when tapping a dial link, say from contacts or embedded phone# in email, phone would prompt which application to use for dialing, 3cx or Phone (built in), at which point you could set a default dialer or select only once.
I'm back to testing and now on Android 6.0.1. I can find no way to change the default dialer, clear the default dialer app etc or at get it to prompt which dialer to use. It appears to be locked to the built in phone dialer. I did uninstall and reinstall 3cx in case it wasn't recognizing it as a phone app, but did not make a difference.
Has this feature been locked down in the latest Android or is there a new way so that you can set 3rd party dialer or at least prompt which dialer to use?