Yealink SIP-T48G Administrator's Manual page 155

Parameters
Phone User Interface:
None
dialplan.area_code.line_id
Description:
Configures the desired line to apply the area code rule. The digit 0 stands for all
lines. If it is left blank, the area code rule will apply to all lines on the IP phone.
Permitted Values:
0 to 16 (for SIP-T48G/T46G/T29G)
0 to 12 (for SIP-T42G)
0 to 6 (for SIP-T41P/T27P)
0 to 3 (for SIP-T23P/G)
0 to 2 (for SIP-T21(P) E2)
Example:
dialplan.area_code.line_id = 1
Note: Multiple line IDs are separated by commas.
Web User Interface:
Settings->Dial Plan->Area Code->Account
Phone User Interface:
None
To configure an area code rule via web user interface:
1. Click on Settings->Dial Plan->Area Code.
2. Enter the desired values in the Code, Min Length (1-15) and Max Length (1-15)
fields.
3. Enter the desired line ID in the Account field or leave it blank.
If you leave this field blank or enter 0, the area code rule will apply to all accounts
on the IP phone.
Configuring Basic Features
Permitted Values
Refer to the following content
Default
Blank (for
all lines)
141