Yealink SIP T2 Series Provisioning Manual page 95

Appendix
Permitted
Parameter Descriptions Web Setting Path
Values
tonelist = element[,element] [,element]...
Where
element = [!]Freq1[+Freq2][+Freq3][+Freq4]
/Duration
Freq: the frequency of the tone (ranges from 200 to
4000 Hz). If it is set to 0Hz, it means the tone is not
played. A tone is comprised of at most four
different frequencies.
Duration: the duration (in milliseconds) of the dial
tone, ranges from 0 to 30000ms.
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,
600+700+800+1000/2000).
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,
600+700+800+1000/2000).
The default value is blank.
Note: It works only if the value of the parameter
"voice.tone.country" is set to Custom.
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