| IC | Interexchange Carrier - IXC - IEC (IEC is preferred). A company providing long-distance phone service between LECs and LATAs. |
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| IEC - Interexchange Carrier | IC - IXC (IEC is preferred). A company providing long-distance phone service between LECs and LATAs. |
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| IEC Miles - Interexchange Carrier (Long Distance) Miles | |
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| Interexchange | Communication between two different LATAs. |
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| InterLATA | Communication between Local Access Transport Areas. 1982 MFJ requires LECs to use an IEC for InterLATA services. |
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| International | Between multiple nations. |
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| Interstate | Between multiple states. Interstate communications are regulated by the FCC. |
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| IntraLATA | Communication within a Local Access Transport Area. 1982 MFJ allows LEC to handle these calls without an IEC. |
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| Intrastate | Communication within a single state. Intrastate communications are regulated by each state's PUC. |
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| IXC | 1) Interexchange Carrier (IEC is preferred). A company providing long-distance phone service between LECs and LATAs.2) Interexchange Circuit. A circuit that connects PoPs. |
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| IXC Miles | On a Price Quote, the coordinates of Location A and Location B are used to calculate mileage-dependent line charges. |
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| IXC MilesInterexchange Carrier (Long Distance) Miles | On a Price Quote, the coordinates of Location A and Location B are used to calculate mileage-dependent line charges. |
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