Hello Bob,
welcome to the Polycom Community.
What happens if you simply dial 98?
Do you end up on your voicemail ?
Have you tried pressing the Forward Softkey and disable the call forward?
User Guides and other documentation can be found => here<=
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services