common transport trunk group
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- A trunk group between exchange carrier switches which transports access traffic for numerous interexchange carriers concurrently and may also carry exchange carrier (EC) traffic. [T1.Rpt 11-1991]
ATIS - Cite This Source - This Definition - all trunks busy (ATB), cross-office trunk, directionalization, group busy hour (GBH), line side, one-way trunk, originating trunk-side access, PBX trunk, trunk encryption device (TED), trunk group, trunk group serial number (TGSN), Type 1 Interconnection Service Provider