Zoiper IAX SIP VOIP Softphone

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v2.25.9
Remove frequently called
Remove artificial limit on Favorites shown
Drop Android 5.x support
Unify fonts
Update billing library to version 7
Ring for incoming call if "incoming call" channel is allowed to ignore DND. Does not work on all phones due to manufacturer limitations.
Apply default value for MWI if provisioning does not contain one(QR or other)
Fix crash on stopping debug log
Fix missing checkbox on Use Reliable Provisional preference
Handle lack of ringtone on some phones