ILEC. The telephone company. An ILEC provides local exchange telephone services to a specific region. During the Enactment of the 1996 Telecommunications Act, those companies providing a substantial share of the local exchange services became known as an ILEC. Since, any carrier that has substantially displaced the current ILEC may itself assume the role or such a carrier exists in a certain location that is comparable to current ILEC may coexist as an ILEC. Being an ILEC requires an entity to perform duties differently than a CLEC (Competitive Local Exchange Carrier) in the same area. The ILEC must provide interconnection points and reasonable feasibly access to those points. This includes collocation facilities. They must provide unbundled access (native transport) on their network. In other words, they must allow reasonable access at a reasonable cost (tariff) to competitors for the delivery and resale of telecommunications services. Most CLECs use the ILECs network to resell services to both residential and commercial customers. OR A term used to refer to a Bell Operating Company.