I've got it working on my Verizon Blackberry for over a year.
1) Contact the Cellular Provider for your Blackberry. Ask for the "Office Message Alert" feature (that's what Verizon calls it). It is designed to receive calls from systems like Octel then send a custom SMS to the intended Cell Phone number. Depending on your plan, I think the charge is $0.02 per SMS received.
2) The Cellular Provider will provide you with a phone number that you will program into your Octel, much like you do for Pager Outcalling. Verizon gave me a toll-free number, I don't know if it is unique to cell phones registered to Verizon's Chicago MSA or if it is global- so I didn't post it here.
3) In Octel menu 6, Create a pager Dialing Sequence that looks like PPPPC2223335555D where 2223335555 is the external phone number of your voicemail system (Call back number which will diplay on your cell phone).
4) Octel menu 9.1 of your VMbox enter this to the following mailbox fields:
>Outcalling Auth Code: 44466688888 (your cell phone number). The 'C' in step 3 dialing sequence will outpulse the Code you put in this field.
>Outcalling Phone Number: enter the number obtained from the Cellular Provider (step 2)
>Pager Type: enter the single digit Pager Dialing Sequence number built in step 3.
You should test the operation, it may be necessary to fine tune the number of 'P' Pauses in step 3.
On the Blackberry I receive the following Text Message in my mobile e-mail: (this does not show up on my Desktop e-mail)
Oct 11, 2005 1:51:32 PM
Callback Number: 2223335555
Office Message Alert
Hope this helps you out.