User Guide for the SIP-T54S Media IP Phone 
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your room when auto answer is enabled on your phone. When you mute the phone in an idle 
state or any other states, the mute key LED illuminates solid red and the icon          appears on 
the status bar. 
 
Note 
Muting a Call 
To mute a call: 
1.  Press          during an active call. 
The mute key LED illuminates solid red. The LCD screen indicates that the call is now muted. 
 
To un-mute a call: 
1.  Press          again to un-mute the call. 
The mute key LED goes out. 
Muting While Dialing 
To mute the microphone while dialing: 
1.  Press          on the pre-dialing, dialing or calling screen. 
The mute key LED illuminates solid red. The call is muted automatically when set up 
successfully. 
Keep mute should be pre-configured by your system administrator.