Hi rudebbwoy,
Now it sounds like you don't have the voicemail ports programmed to hunt group 7. As TouchToneTommy indicated, the voicemail ports (all) must be programmed to hunt group 7 (#505, group 7, make sure the voicemail extensions are set to "1" - assigned). No other extensions can be programmed into that group. Does the voicemail say something like "transferring to the operator"? If it does, then this is the problem.
Incoming lines are assigned to the attendant (voicemail) by assigning the lines (#206, hunt group 7, line 01, 02, 03...). Again, "1" is assigned.
-Chris