Firstly you will need to dial a valid number... CallCentric will receive the request to phone 333333333333 and will immediately recognize it as an invalid number. CallCentric will then immediately notify Axon the number is invalid and can't be dialed and then Axon in turn will notify the client SIP device or VoIP softphone.
These are two test numbers provided by CallCentric that are free to call. You can use them to check to see if the call is actually going through to CallCentric. If you dial these numbers (with the 81 prepended) and the call still does not go through.. the problem could be any number of things including an issue with your dialing plan (make sure you tell the system to remove the first two digits (81) when dialing).
Free CallCentric Testing Numbers:
1) Tell Me
17771234567
(Interactive Voice Phone Service)
2) Directory
411
(Person/Business directory look-up)