Try specifying them as "DTN" in LD 81:
REQ CNT (or LST for a detailed list)
CUST (hit Enter until the FEAT prompt)
FEAT DTN (then Enter until it prints)
Those are all your standard analog lines, modems, faxes, etc. They are listed as 2500, as shirleynot said. The rest are programmed as DIP (vs. DTN) and used for things like elevator phones, as also mentioned..