Yealink SIP-T2 Series Provisioning Manual page 111

Permitted
Parameter
Values
voice.tone.rin
String
g =
voice.tone.bus
String
y =
Descriptions
Where
element =
[!]Freq1[+Freq2][+Freq3][+Freq4]
/Duration
Freq: the frequency of the tone (ranges
from 200 to 7000 Hz). If it is set to 0Hz, it
means silence. 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 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.
It customizes the ringback tone when
the parameter "voice.tone.country" is
set to Custom.
The value format is Freq/Duration. For
more information on the value format,
refer to the parameter
"voice.tone.dial".
The default value is blank.
It customizes the busy tone when the
parameter "voice.tone.country" is set
to Custom.
The value format is Freq/Duration. For
more information on the value format,
refer to the parameter
"voice.tone.dial".
The default value is blank.
Appendix
Web Setting Path
Settings->Tones->
Ring Back
Settings->Tones->
Busy
101