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?