trunk connection

XKM/ JXT1 series T-type connector and T-type terminal box are used for branch line Ttype connection in the construction and industrial electric equipment when cable trunk can't be cut off.

JXT1系列“T”接端子及电缆“T”接箱主要适用于建筑、工业电气设备中作主电缆（干线）不能切断时的“T”形分线连接用。

Since such special trunk circuits are only used during that part of a call that requires connection between locations, such trunks are more efficient than normal tie trunk circuits.

然后该中继线路获得释放，可以为其它呼叫提供服务。由于这根特殊的中继线路仅仅在需要在两个商店之间建立呼叫链接时才使用，因此比常规的专用中继线使用效率更好。

Because a SIP Trunk is not a physical connection, there is no explicit limit on the number of calls that can be carried over a single trunk.

因为一个SIP中继不是物理连接，也没有就可以在一个单一的电话号码进行明确的主干限制。