In the first instance, check your VoIP/Phone hardware or software. Check that it is powered on and operating and also whether it is logged into the DrayTEL server. Check that your passwords are correct.
You should also check that you have adequate call credit on your account if you cannot make outgoing calls. Try calling in/out from different locations (e.g. mobile/landline) to narrow down the problem. If you contact support for assistance, please confirm that you have completed these checks.