The ivt form (Inter-Vendor Trunk) is used to identify intervendor trunk group number which can also work when a neighbor system has a trunk group number that is higher than AUTOPLEX can handle.

• ivt 表（交叉运营中继器）用于标识交叉运营中继器群数，当相邻系统的中继器群数高于 AUTOPLEX 可以控制的中继器群数时，该中继器群数仍有效。