Yealink SIP-T23P User Manual page 73

For more information on the valid values for the Account field, refer to
on page 59.
4. Click Confirm to accept the change.
Note
The default values of minimum and maximum length are 1 and 15 respectively.
Area code is configurable via web user interface only.
You can block specific numbers from being dialed on your phone. When you dial a
block out number on your phone, the dialing will fail and the LCD screen will prompt
"Forbidden Number". You can add 10 block out rules at most on your phone.
To add a block out number via web user interface:
1. Click on Settings->Dial Plan->Block Out.
2. Enter the desired value in the BlockOut Number field.
3. Enter the desired line ID in the Account field or leave it blank.
Customizing Your Phone
Replace Rule
63