CAMA:Centrelized Automatic Message Accounting,集中自动计费。关联词:LAMA、PAMA
CCF:Call Control Function,呼叫控制功能
CDSI:Chinese Terminal Service Interface,中文信息服务终端接口
CENTREX:Centrex,虚拟用户交换机
CFB:Call Forwarding Busy,遇忙呼叫前转
CFNR:Call Forwarding No Reply,无应答呼叫前转
CFU:Call Forwarding Unconditional,无条件呼叫前转
CHILL:CCITT High Level Language,CCITT高级语言
CONF:Conference Calling,会议呼叫
CT2:cordless telephony 2,第二代无绳电话
CTI:Computer Telephone Integration,计算机与电话集成