User`s guide

6-52 Setting up Meridian Mail security
Supplemental Digit Restriction
Standard 1.0 System Administration Guide January 1998
Supplemental Digit Restriction
Description
Because most toll-fraud calls are placed to international
locations, you can use Supplemental Digit Restriction (SDR) to
block calls to international locations that your users do not need
to call.
How SDR works
Supplemental Digit Restriction enables you to block calls to
certain telephone numbers within exchanges, area codes, or
country codes. For example, you may have legitimate
international calling requirements to many countries but none to
those countries typically associated with fraud. Supplemental
Digit Restriction lets you block calls to those countries.