Yealink IP Phones Auto Provisioning Guide
Parameter
voice.tone.dial
88
Permitted
Values
China,
The default value is Custom.
Czech,Czech
ETSI, Denmark,
Finland,
France,
Germany,
Great Britain,
Greece,
Hungary,
Lithuania,
India, Italy,
Japan,
Mexico, New
Zealand,
Netherlands,
Norway,
Portugal,
Spain,
Switzerland,
Sweden,
Russia, United
States,
String
It customizes the dial tone.
Descriptions
Settings->Tones->Dial
Web Setting Path