scope:

This standard is one of a series of interface compatibility specifications prepared by the Services, Architecture, and Signaling Interfaces Subcommittee of Committee Tl. The series provides technical requirements for the interfacing of cellular mobile carriers (CMCs), wireline exchange carriers (ECs), interexchange carriers (ICs), international carriers (INCs), and consolidated carriers in paired interface combinations.

This standard provides technical requirements for EC-to-IC calls using an Exchange-Interexchange (E-I) Interface that interconnects a switching system in the EC network with a switching system in the IC, INC, or consolidated carrier network. The interface is at a point of termination (POT) between the two switching systems.

Technical requirements for IC-to-EC calls are described in American National Standard for Telecommunications - Exchange-Interexchange Carrier Interfaces - Individual Channel Signaling Protocols, ANSI T1.104-1988.

In the remainder of this standard, unless otherwise noted, the term IC connotes IC, INC, or consolidated carrier.

This standard supersedes American National Standard T1.109-1988, in which the carrier access code was specified as 95O+WXXX where W = 0 or 1 and X = 0 to 9.

Purpose.

The purpose of this standard is to enable separate entities to provide interconnecting equipment that will operate compatibly Quantitative descriptions are provided in this standard of the specific characteristics of the interconnecting systems required to achieve this objective.