电信常用业务介绍+电信业务+中国电信

目录 1 语音业务.......................................................................................................................................... 3 1.1 普通电话 ................................................................................................................................. 3 1 .1 .1 业务介绍： ..................................................................................................................... 3 1.1.2 实现方式 ......................................................................................................................... 4 1.2 无线市话 ................................................................................................................................. 4 1 .2 .1 业务介绍 ......................................................................................................................... 4 1.2.2 实现方式 ......................................................................................................................... 4 1.3 模拟中继 ................................................................................................................................. 5 1 .3 .1 业务介绍 ......................................................................................................................... 5 1 .3 .2 实现方式 ......................................................................................................................... 5 1.4 ISDN ........................................................................................................................................ 6 1 .4 .1 业务介绍 ......................................................................................................................... 6 1 .4 .2 实现方式 ......................................................................................................................... 6 1.5 汇线通 ..............................................................