Drivers are to be advised to use a hands - free device should they wish to use car mobile telephone while driving 驾驶时如要使用汽车电话无电话，应使用免提话筒的通话装置。
2.
Alarm systems - alarm transmission systems and equipment - requirements for systems with digital communicators using the public switched telephone network 警报系统.警报发送系统和设备.使用公共交换电话网络数字通话装置系统的要求
3.
Alarm systems - alarm transmission systems and equipment - requirements for equipment used in systems with voice communicators using the public switched telephone network 警报系统.警报发送系统和设备.使用公共交换电话网络声音通话装置系统用设备要求
4.
Alarm systems - alarm transmission systems and equipment - requirements for equipment used in systems with digital communicators using the public switched telephone network 警报系统.警报发送系统和设备.使用公共交换电话网络数字通话装置系统用设备要求
