Probably blocked by the security policy.
Search for how to remove security policy on the boards - there is an excellent thread on how to do that - i know it works - i also had my old work 8800 and did the same thing.
Since your BB connects through BES, the IT policy blocks the phone function and ability to use any third-party application not approved your IT administrator. There is no way to get around it since your IT admin can push the IT policy periodically.