It's not going to be easy no matter how you do it. You could run an export for 2500-2554-modem-fax and get a good count on your analog sets. Then you would have to cover (and it might be easier) to list this same data for whatever types of digital sets your running. Then compare this with what's on the "disp cap" and see how close you get.
You can also run this. "list set type 2500 (or whatever you want here)" to pull them up.
When is the last time you helped someone, just because you were able to?
For the best response to a question, read faq690-6594