satellite toll trunk 卫星长途中继线

special toll trunk circuit 专用长途中继电路

both way toll trunk circuit 长途双向中继电路

bothway toll trunk circuit 长途双向中继器

both-way toll trunk circuit 长途双向中继电路

toll-connecting trunk 长途连接干线

toll switching trunk 长途交换干线

toll outgoing trunk 长途出局中继线

toll dialing trunk 长途拨号中继线