A way of carrying telephone signaling information along a path different from the path used to carry voice.

一种传输电话信令信息方式，所使用的路径与话音路径不同。

youdao

A way of carrying telephone signaling information along a path different from the path used to carry voice.

一种传输电话信令信息方式，所使用的路径与话音路径不同。

youdao