CTC

Click To Conference

点击会议业务

CTD

Click To Dial

点击呼叫业务

DTMF

Dual Tone Multiple Frequency

双音多频

EC

Enterprise Communication

企业通信

IPT

IP Telephone

IP语音

PBX

Private Branch Exchange

小交换机

PGM

Presence Group Messaging

状态群组消息

SIP

Session Initiation Protocol

会话初始化协议

VMR

Virtual Meeting Room

虚拟会议室