Office identification for the far end circuit. [ Ref: ANSI T1.113/3.11A ]
With respect to offices A and Z the following conventions are used:
(a) For one-way trunk groups, the originating switch that offers traffic to the trunk group is office A.
(b) For two-way trunk groups, the switch with the lower alphanumeric CLLI code is designated office A.
(c) For one-way subgroups of a divided trunk group, the originating switch is designated office A.
(d) For two-way subgroups of a divided trunk group, the switch with the lower alphanumeric CLLI code is designated office A.