Establishment Cause：
Originating Conversational Call 会话类主叫（语音，视频电话主叫...）
Originating Streaming Call 流媒体类（移动电视...)
Originating Interactive Call 交互类（Web浏览）
Originating Background Call 背景类（FTP下载 SMS EMAIL）
Originating Subscribed traffic Call
Terminating Conversational Call 会话类被叫（ 语音被叫... )
Terminating Streaming Call 流媒体类被叫
Terminating Interactive Call 交互类被叫
Terminating Background Call 背景类被叫
Emergency Call 紧急呼叫
Inter-RAT cell re-selection 系统间小区重选
Inter-RAT cell change order 系统间(PS)
Registration 注册、位置更新
Detach 去附着
Originating High Priority Signalling 彩信发送(发)/HSDPA 有这两种说法：个人认为是彩信业务，字面意思为高优先级信令或信息
Originating Low Priority Signalling 短信发送(发)
Terminating High Priority Signalling 短信发送(收)/HSDPA Originating和Terminating 就一个主叫和被叫的区别，对应短信彩信也就是发送与接收的区别
Terminating Low Priority Signalling 短信发送(收)
Call re-establishment 呼叫重建