2-pair wire is no longer "normal". The bare minimum that you _should_ be able to purchase at the wholesaler is Cat-3 FOUR pair. That will support Merlin ATL sets, and any type of 1, 2, or 3 pair electronic key system telephones, and of course up to 4 dial tones if not using a key system. Anyone still selling 2 or 3 pair I/W should have their heads examined.