OGC Outgoing Trunk Circuit 送出的中继线路
outgoing trunk circuit group 出中继电路群
OGTC Outgoing Trunk Circuit 送出中继线路
OTC Outgoing Trunk Circuit 送出中继线电路
toll outgoing trunk circuit 长途去话中继器
outgoing trunk circuit testing 出中继电路测试
outgoing toll trunk circuit 长途去话中继电器
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