Cisco UCM 7.1 - blocking robo calls

I have had a few incidents where a robo call will call one of my DIDs 4, 6 times simultaneous - with some odd results.  I can not get in contact with whoever owns that number as when I call it - the only option is to enter a code that of course I don't know.  Anyhow - I was looking for advise o how best to block these.  I connect to the PSTN via a SIP trunk from my 3845 ISR.  Would the blocking be best done at that point?  And what would be the most efficient means to implement a sort of SIP access list to send calls from that number to the bit bucket?
amigan_99Network EngineerAsked:
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José MéndezConnect With a Mentor Commented:
This might help you blocking the incoming call from the gateway, CM 7.1 doesn't have what it takes to discriminate calls based on the calling number:
amigan_99Network EngineerAuthor Commented:
Perfect.  Thank you!
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