PURPOSE: This rule enables terminating carriers to establish trunking arrangements for LEC-to-LEC traffic separate and distinct from trunking arrangements used for IXC traffic. (1) At its discretion, a terminating carrier may elect to establish separate trunk groups for interexchange carrier (IXC) and Local Exchange Carrier-to-Local Exchange Carrier (LEC-to-LEC) traffic. Terminating tandem carriers shall work cooperatively with, and abide by requests of, terminating carriers to establish separate trunking arrangements for IXC and LEC-to-LEC traffic occurring between a terminating tandem carrier and a terminating end office.

1. (2) A transiting carrier may opt to not install separate trunk groups to a requesting terminating carrier if the transiting carrier assumes financial responsibility for all compensable transiting traffic delivered to the terminating carrier.
2. (3) All terminating carriers electing to create category 11-01-XX records shall establish a trunk group for LEC-to-LEC traffic that is separate from trunk groups for IXC traffic. Such LEC-to-LEC trunk group shall be used to connect the end office to the tandem serving that end office.
3. (4) After a terminating carrier elects to establish separate trunk groups for IXC and LEC-to-LEC traffic, IXC traffic shall not be placed on the LEC-to-LEC trunks between the terminating tandem carrier and terminating end office.

AUTHORITY: sections 386.040 and 386.250, RSMo 2000.* This rule originally filed as 4 CSR 240-29.050. Original rule filed Nov. 30, 2004, effective July 30, 2005. Moved to 20 CSR 4240-29.050, effective Aug. 28, 2019. *Original authority: 386.040, RSMo 1939 and 386.250, RSMo 1939, amended 1963, 1967, 1977, 1980, 1987, 1988, 1991, 1993, 1995, 1996.