Hi
All you need to do is create a Group Hunt List (GHT) in ld 18. It is programmed much like a speedcall list, simply assign the analogue dn's to entries in the list, once completed it would look similar to this when printed in ld 20.
00 5500
01 5501
02 5502
..
..
15 5516
Once the list is created, you need to create the Pilot Number (PLDN) for the GHT, this is created in ld 57. You simple create a dn and assign the list number that you just created. Once completed, if set to linear hunting, when the PLDN is dialled, dn 5500 will ring. The next call will try 5500 and find it busy thus 5501 will ring.. etc.
Give it a go.