When transferring a call to a cell phone, can the VoicePro be programmed to take a message after a delay if the cell phone is not picking up when switched?

Yes. You need to enable "remote call screening" with function 17. Then the system will take the call back again if there is no answer or if you answer and do not accept the call after hearing the caller's name.

If your cell phone answers automatically, it will not respond to the screening request. So the VoicePro will take the caller back and it will play the greeting of the extension's voice mailbox before taking a message.

One other thing to keep in mind is that the above will only work if you let the system transfer the forwarded calls using the hook-flash transfer method. If you program it to use a second line to forward calls, it will not take unanswered calls back again. Hook-flash transfer works only if you have 3-way calling or Centrex on your phone line(s).