I've had terrible problems with softphones. While Zoiper works ok, it's clunky, has no interface with Outlook, and worst of all has very faint sound that I have not figured out how to increase yet

I have been trying Ninja and it looks like a superior product. I use it with sipgate and I love it. The CTI support is great. It integrates with Outlook and even with Snom phones for the pay version.

My problem is that I can't make it work with voipfone. I can make it register for a few minutes but after a while it deregisters and nothing will make it register again. It says that login fails and refuses to register. I have tried with and without outbound proxy and the behaviour is the same

Any help would be appreciated.