Yealink SIP-T54S Administrator's Manual page 567

Details of Configuration Parameter:
Parameter
features.allow_mute
Description:
Enables or disables the allow mute feature for the IP phone.
0-Disabled
1-Enabled
If it is set to 1 (Enabled), you are allowed to mute an active call, or activate the mute feature
on the pre-dialing/dialing/calling/ringing screen (Mute the microphone on the calling
screen is only applicable to the SIP-T54S/T52S/T48G/T48S/T46G/T46S/T29G IP phones).
Note: For SIP-T23P/T23G/T21(P) E2 IP phones, you are allowed to activate the mute feature
on the pre-dialing/dialing/calling/ringing screen only if the value of the parameter
"features.keep_mute.enable" is set to 1 (Enabled).
Web User Interface:
Features->General Information->Allow Mute
Phone User Interface:
None
To configure allow mute via web user interface:
Click on Features->General Information.
1.
Select the desired value from the pull-down list of Allow Mute.
2.
Click Confirm to accept the change.
3.
Configuring Basic Features
Permitted Values
0 or 1
Default
1
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