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Hi wanted to know if the T21P phones can be configured to not make calls to fixed or mobile numbers, in ip pbx can not be programmed and have 20 phones and I just want them to call abroad 4, the rest only for internal calls.

A greeting
Block out rule prevents users from dialing out specific numbers. When entered numbers match the predefined block out rule, the LCD screen prompts “Forbidden Number”. IP phones support up to 10 block out rules.

Web User Interface:
Settings->Dial Plan->Block Out->BlockOut NumberX

You can get more info from the guide(page 224) below.
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