Telecommunications - telephone terminal equipment - technical requirmeents for connection of terminal equipment to the telephone network 电信.电话终端设备.与电话网络相连的终端设备的连接技术要求
Telecommunications - telephone terminal equipment - technical requirements for connection of terminal equipment to the telephone network , addendum 1 电信.电话终端设备.终端设备到电话网络连接的技术要求.补充件1
Telecommunications - telephone terminal equipment - technical requirements for connection of terminal equipment to the telephone network - addendum 2 电信.电话终端设备.连接到电话网络的终端设备的技术要求.附录2
Telecommunications , telephone terminal equipment , technical requirements for connection of terminal equipment to the telephone network - addendum 3 远程通信电话终端设备以及与电话网络相连的终端设备的技术要求.附件3
Telecommunications - telephone terminal equipment - transmission requirements for narrowband voice over ip and voice over pcm digital wireline telephones 电信.电话终端设备.声音大于ip和pcm数字有线电话的窄带声音的传输要求
