Something to keep in mind, if you use the pilot table you must assign the number of channels alloted for this DID and if you have more than one pilot table entry the combin number for the entire table can not exceed 23 for a full PRI. Example Piolt table 1 555-555-1234, 21 Pilot table 2 555-555-1235, 2. The total=23 Pilot tables are helpfull if you wish to program ringing for a DID the same as you would an analog CO.