We originally had 5 incoming lines into our building, 4 more were added. 3 lines were added to pool A and the 4th was placed on pool B. If you dial the new number for the building it comes up on the approiate new line number 6-8. If you dial in on line 9 which is the only line on pool B it comes in on the intercomm button. WHY??? But when you try to dial out on that specific new line 6-9 it automatically puts you on line 1. On lines 1-5 you can dial out on whatever line you choose. But I don't understand what the defference is for the new lines. If it matters or not we are connected to a Centrex system from the telephone company. Any help would be greatly appreciated.