Yealink SIP-T19 - Manual (Page 67)

Customizing Your Phone
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2. Enter the desired values in the Code, Min Length (1-15) and Max Length (1-15)
fields.
3. Click Confirm to accept the change.
Note
You can block some 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.
Area code is configurable via web user interface only.