Kept on Wikipedia:Interface functionality

In telephony, interface functionality is the characteristic of interfaces that allows operators to support transmission, switching, and signaling functions identical to those used in the enhanced services provided by the carrier.

As part of its comparably efficient interconnection (CEI) offering, the carrier must make available standardized telephone networking hardware and software interfaces that are able to support transmission, switching, and signaling functions identical to those used in the enhanced services provided by the carrier.

References

 This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".

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