Yealink W60P Administrator's Manual page 217

Details of Configuration Parameters:
Parameters
dialplan.area_code.code
Description:
Configures the area code to be added before the entered numbers when dialing out.
Example:
dialplan.area_code.code = 0592
Note: The length of the entered number must be between the minimum length configured
by the parameter "dialplan.area_code.min_len" and the maximum length configured by the
parameter "dialplan.area_code.max_len".
Web User Interface:
Settings->Dial Plan->Area Code->Code
Handset User Interface:
None
dialplan.area_code.min_len
Description:
Configures the minimum length of the entered numbers.
Web User Interface:
Settings->Dial Plan->Area Code->Min Length (1-15)
Handset User Interface:
None
dialplan.area_code.max_len
Description:
Configures the maximum length of the entered numbers.
Note: The value must be larger than the minimum length.
Web User Interface:
Settings->Dial Plan->Area Code->Max Length (1-15)
Handset User Interface:
Configuring Basic Features
numbers.
Navigate to:
http://<phoneIPAddress>/servlet?
p=settings-areacode&q=load
Permitted Values
String within 16 characters
Integer from 1 to 15
Integer from 1 to 15
Default
Blank
1
15
197