Server Internal Error?

I have missed several calls. In my call history it shows a fail status for each call and a server internal error as the reason.

Any help?

This could be due to a number of issues but most likely the forwarding. Gtalk or a poorly configured SIP client can produce this

I would try a different forwarding destination or check to make sure your current one is configured properly on your side

Send us your username and we can have a look.