Hello!
First of all - thank you for your beautiful product!
I've used PhonerLite on Win7 machine. 
And then I've decided to upgrade OS to Win10.
After that I have problems:
After small period of registration on SIP-server - I can't receive an incoming calls: - /
PhonerLite signalize that I'm successfully registered on SIP server, and the SIP-server signalized that I have successfully registration.
But, all callers who calls to me hearing a ringing signal.
And in this moment PhonerLite don't show me any notifications about incoming call..

I've tried to disable all of firewalls, but this actions doesn't helped me.. 

The only one of action what helps me - re-registration on the server.
All other of SIP cliens working perfectly and I have not seen this problems.
It will be perfect if you can give me some ideas to fix this trouble. 
Thank you!

You can configure the registration period in PhonerLite. Try to decrease the value (e.g. 60 seconds).

Ich hatte bisher mit der Option "Windows Firewall" unter Konfiguration -> Netzwerk deutlich weniger solche "Fehlregistrierungen". Ich bin mir noch nicht sicher ob es damit ganz weg ist, aber das scheint bei mir das Problem gelöst zu haben.