Yealink SIP-T2 SERIES Administrator's Manual page 854

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Parameters
You can configure at most eight different tones for one condition, and separate them by
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.
Web User Interface:
Settings->Tones->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.
Web User Interface:
Settings->Tones->Ring Back
Phone User Interface:
None
voice.tone.busy
Description:
Customizes the tone when the callee is busy.
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.
Web User Interface:
Settings->Tones->Busy
Phone User Interface:
None
voice.tone.congestion
830
Permitted Values
String
String
String
Default
Blank
Blank
Blank