Dialing Restrictions and Permissions
You can restrict outside calling from an extension by using these various features:
Allowed Phone Number Lists
Allowed List Assignments
Disallowed Phone Number Lists
Disallowed List Assignments
Line Access Restriction
Outgoing Call Restriction
SECURITY ALERT:
While procedures that restrict dialing are very effective, absolute protection against misuse cannot be guaranteed. System telephones give you more protection against such misuse than single-line telephones. Therefore, you should install system telephones where restricting telephone use is important.
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