Default [Q] Native SIP client throwing Server_error for outgoing calls??

I have add my SIP account. I am able to receive in coming calls. But when I dial out going calls giving "SERVER ERROR. PLEASE TRY AGAIN". I thinks I added all correct information. otherwise I wouldn't get incoming calls.

see the screenshots for settings.

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What could be the problem?

Samsung galaxy S3
Android 4.4.4
Omni ROM