Yealink SIP-T54S Administrator's Manual page 864

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
commas. (e.g., 250/200,0/1000,200+300/500,200+500+800+1500/1000).
If you want the IP phone to play tones once, add an exclamation mark "!" before tones
(e.g., !250/200,0/1000,200+300/500,200+500+800+1500/1000).
Note: It works only if the value of the parameter "voice.tone.country" is set to Custom. If
you want to disable this warning tone, set it to 0.
Web User Interface:
Settings->Tones->Dial
Phone User Interface:
None
voice.tone.secondary_dial
Description:
Customizes the secondary dial tone.
The value format is Freq/Duration. For more information on the value format, refer to the
parameter "voice.tone.dial".
Note: It works only if the value of the parameter "voice.tone.country" is set to Custom. If
you want to disable this warning tone, set it to 0.
Web User Interface:
Settings->Tones->Secondary Dial
Phone User Interface:
None
voice.tone.ring
Description:
Customizes the ringback tone.
The value format is Freq/Duration. For more information on the value format, refer to the
parameter "voice.tone.dial".
Note: It works only if the value of the parameter "voice.tone.country" is set to Custom. If
you want to disable this warning tone, set it to 0.
Web User Interface:
Settings->Tones->Ring Back
Phone User Interface:
None
voice.tone.busy
838
Parameters Permitted Values
String
String
String
Default
350+440/300
0
Blank
Blank