Please check that you have an internet connection and that your phone is registered/getting an IP address.

Please make sure the number you are calling has not been disconnected.

If you are calling a local number, please ensure that your dial plan is correct.

If SIP-ALG is enabled on your router, please try disabling then try again.

If you pay for a call plan, you may get an automated message about credit.

Please contact us for further information/assistance.