呼叫速度慢，并且不能保证主叫用户快速、准确地找到需要接听的被叫用户；
The dialing is slow and the system can't ensure the calling party fast and accurately put through the called one who is asked for receiving.
无应答时呼叫的完成(CCNR)是一种向主叫用户提供的ISDN补充业务。
Completion of Calls on No Reply (CCNR) is an ISDN supplementary service offered to the calling user.
本建议描述由于如主叫用户或被叫用户拆线的非正常条件导致释放连接的安排。
This Recommendation describes arrangements for releasing connections resulting from abnormal conditions such as calling or called party clearing.
一种主叫用户预获知被叫所处时间的方法，当用户进行拨号时，将给出呼叫预处理提示；
The invention discloses a method for a calling user knowing beforehand the time when a called user is. As a user dials a number, a calling preprocessing prompt is given;
这样主叫用户不再是仅仅听到单调的振铃声或单纯的歌曲、乐曲，而是可以看到极具个性的视频播放。
The caller would no longer just hear the monotonous ring tone or a simple song or music but able to see the personalized video playback.
这样主叫用户不再是仅仅听到单调的振铃声或单纯的歌曲、乐曲，而是可以看到极具个性的视频播放。
The caller would no longer just hear the monotonous ring tone or a simple song or music but able to see the personalized video playback.
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