While single frequency tones worked on certain phone routes, the most common signaling on the then long distance network used Multi-Frequency tones. 而某些单频音调闪耀电话线最常见的则长途信令网采用多频音调。
The target of this invention is to provide a design and realizing method based on a digital tandem signaling gateway and a medium gateway. 本发明目的是提供一种基于数字中继信令网关与媒体网关的设计与实现方法。
