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Understanding ILEC and IEC Services in Telecommunications

This chapter provides a comprehensive overview of services offered by Incumbent Local Exchange Carriers (ILEC) and Inter-Exchange Carriers (IEC). Key topics include Local Dial Tone, Centrex services for large businesses, Direct Inward Dialing (DID), Direct Outward Dialing (DOD), and TIE line rentals for connecting PBXs. It also covers the concept of Foreign Exchange, Wide Area Telecommunications Service (WATS) for discounted long-distance calls, and toll-free services (800/888 numbers). This guide is essential for understanding modern telecommunications infrastructure and service options.

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Understanding ILEC and IEC Services in Telecommunications

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  1. Carriers (chapter 6) ENGR 475 – Telecommunications Harding University Fall 2006 Jonathan White

  2. ILEC Services • Local Dial Tone • Centrex • Rented from ILEC, for businesses with over 100 lines, performs call waiting, etc… • DID – Direct Inward Dialing • Handled by the PBX/Centrex system • DOD – Direct Outward Dialing (dial 9 first) • Pay phones • Not expanding

  3. ILEC Services • TIE line rental • Private, high speed, used to link 2 PBX’s together, charged on a flat rate • Can be very expensive • Foreign Exchange • Allows a customer to call a local number • That call then gets routed to your location • WATS • Wide Area Telecommunication Service • Created in the 1970’s to allow customers some breaks when calling long distance • 800/888/877/866 • Allows customers to call you toll free • The business pays for the call at a reduced rate

  4. IEC Services • Inter-exchange carrier • Long distance carriers • Switched Long Distance (DDD) • Credit card dialing • Directory assistance • Other similar services such as: • WATS – volume discounted calling • 800/888 numbers • Remote call forwarding (similar to FX)

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