Example:
1. Your extension is 5555
2. To call your office from home you dial 333-444-5555
3. 333 being NPA / 444 being NXX / 5555 is your DN
If you are at your desk and you dial 7777 to get to vmail, you would do something similar to call the voicemail from your home.
1. you call 333-444-7777 and you would get the same prompts as if you dialed 7777 from in your office.
Now if you don't have a DID number assigned as your Voice Messaging access CDN, then you may have to create one in the PBX and then add it to your service DN's.
To do this, just pick a DID extension (5556) for example.
Create either a phantom TN or dummy ACDN. I prefer a Phantom TN with DCFW 4 to 5556. If you are making a dummy ACDN you would NCFW to 5556 with MAXP set to 1.
Then you log into Call Pilot Manager and find the Service DNs (don't quote me on the name but it is the drop down just to the right of "User".
Create a new Service DN (5556) and set the type as Voice Messaging. Save, yada yada.....logoff.
Then you can dial 333-444-5556 from home and log into your Call Pilot to retreive your voicemails.
Hope this helps.