SIP-T790 IP Phone User Manual
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4.8.2.4 Limit outgoing calls
You can set restrictions on outgoing numbers and restrict the phone from dialing
certain numbers. T790 supports up to 10 restricted outgoing numbers. When the
number you call matches the rule, the phone LCD will display the words "Forbid
Number".
- Add restriction rules through web interface
1. Log in to the phone page by IP address.
2. Click
Settings (E) -> Dial Plan (k) -> Block out .
3. Fill in the number to be blocked out in the blocked out number field.