Yealink SIP T2 Series Provisioning Manual page 109

Parameter
features.redial_tone
features.partition_tone
Permitted
Values
warning tone every 30 seconds when there is a
call on hold.
The default value is 30.
Note: It works only if the value of the parameter
"features.play_hold_tone.enable" is set to 1
(Enabled).
It configures the IP phone to continue to play the
dial tone after inputting the preset numbers on the
pre-dialing screen.
Example:
features.redial_tone = 125
Integer within
The IP phone will continue to play the dial tone
6 digits
after inputting "125" on the pre-dialing screen.
If it is left blank, the IP phone will not play the dial
tone after inputting numbers on the pre-dialing
screen.
The default value is blank.
It enables or disables the IP phone with active
accounts to play dial tones differently from the IP
0 or 1
phone with no active accounts.
0-Disabled
Descriptions
Features->Audio->Redial Tone
Appendix
Web Setting Path
103