电信常用术语大全 Accunet 光谱数码服务(Accunet spectrum digital service) ACD 回电话信息(ACD Call Back Massaging) ACD 呼叫人直呼路由(ACD Caller Directed Call Routing) ACD 中央电话总机(ACD Central Office) ACD 有条件的路由(ACD Conditional Routing) ACD 数据直接呼叫路由(ACD Data Directed Call Routing) ACD 智能呼叫处理(ACD Intelligent Call Processing) ACD 号码(ACD Number) ACD:自动呼叫分配器(Automatic Call Distributor) 直流-交流振铃(AC-DC Ringing) ACU:自动呼叫单元(Automatic Calling Unit) ACX:异步交叉连接(Asynchronous Cross-connect) ADA:平均放弃延长时间(Average Delay to Abandon) ADACC:自动完成目录查询协助呼叫(Automatic Directory Assistance Call Completion) ADAD:自动拨号和回应装置(Automatic Dialing and Announcing Device) 适应性的通道分配(Adaptive Channel Allocation) ADAS:自动地址目录查询帮助服务(Automated Directory Assistance Service) ADC:模拟信号到数字转化器(Analog-to-Digital Converter) 允许第三方加入的电话功能(Add-on Conference) 外加的数据模块(Add-on