| 摘要 |
A system (200) for muting a portable radio (104) includes a mobile radio (106) having a mute switch (108). Upon activating the mute switch (108), a signalling message is generated (ISW) by radio (106) that is in turn transmitted to the system central controller (202). The system central controller (202) then sends a mute signalling message (OSW) directed to portable radio (104). Upon decoding the signalling message, portable radio (104) is placed in a muted condition, thereby preventing the device from unmuting. Portable radio (104) can become automatically unmuted by either the pressing of the PTT switch found on radio (104) or by the radio user opening the door (116) of his vehicle (102).
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