Yealink SIP-T54S Administrator's Manual page 200

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
Features->Power LED->Ringing Power Light Flash
Phone User Interface:
None
phone_setting.mail_power_led_flash_enable
Description:
Enables or disables the power indicator LED to flash when the IP phone receives a voice
mail or a text message.
For SIP-
T54S/T52S/T48G/T48S/T46G/T46S/T42G/T42S/T41P/T41S/T40P/T40G/T29G/T27P/T
27G/T23P/T23G/T21(P) E2 IP phones:
0-Disabled (power indicator LED does not flash)
1-Enabled (power indicator LED slowly flashes (1000ms) red)
For SIP-T19(P) E2 IP phones:
0-Disabled (power indicator LED does not flash)
1-Enabled (power indicator LED slowly flashes (1000ms) yellow)
Note: It is not applicable to CP860/CP920 IP phones.
Web User Interface:
Features->Power LED->Voice/Text Mail Power Light Flash
Phone User Interface:
None
phone_setting.mute_power_led_flash_enable
Description:
Enables or disables the power indicator LED to flash when a call is muted.
For SIP-
T54S/T52S/T48G/T48S/T46G/T46S/T42G/T42S/T41P/T41S/T40P/T40G/T29G/T27P/T
27G/T23P/T23G/T21(P) E2 IP phones:
0-Disabled (power indicator LED does not flash)
1-Enabled (power indicator LED fast flashes (300ms) red)
For SIP-T19(P) E2 IP phones:
0-Disabled (power indicator LED does not flash)
1-Enabled (power indicator LED fast flashes (300ms) yellow)
Note: It is not applicable to CP860/CP920 IP phones.
Web User Interface:
Features->Power LED->Mute Power Light Flash
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Parameters
Permitted
Default
Values
0 or 1 1
0 or 1 0