blacklisting phone numbers (incoming calls)

I need to block some phone numbers from calling my office number. How can i achieve this. my office uses cisco call manager 4.3
absalaxAsked:
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Reid PalmeiraConnect With a Mentor Telecom EngineerCommented:
Depending on what you use for the PSTN gateway it might be able to block this on an H.323 gateway, but this isn't something you can do in CallManager itself.
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