To access/create the work-group VM press the voicemail button on your phone.
Default password for the voicemail is 1234.
Dial *# then the extension of the voicemail box (verify in director/connect, IE 5070)
then enter the password.
You will choose a new password and record a name announcement IE "Company Department".
when finished with the setup press 7 for mailbox options and 1 to record a personal greeting. This is where you will record the actual greeting for the work-group mailbox.