EC500 is a licensed feature. You need to use 1 per number you want to block - so you need at least 1 EC500 license.
As for blocking it to all numbers except 1, you can do that in CORs. Each COR has a setting of whether it is allowed to call other CORs or not - so, you'd just have 1 COR that is not allowed calling any other CORs, except for a special COR and you put that special COR on the phone you want to be able to be called.
You can try incoming call handling treatment. On the inbound trunk group look for the inbound digits delete them and add a sodt number and bridge it on the set you want to answer this call.
Service/ Number Number Del Insert Per Call Night
Feature Len Digits CPN/BN Serv
public-ntwrk 5 82948 5 82149
public-ntwrk 5 83884 5 22006
you should see ec500 on tab 9, under Off-PBX Telephone - EC500
I used that EC500 method and it works great. I took a spare extension and gave it a COR that was fully restricted. I then put an entry in the off-pbx table with this spare extension and associated it to the number I wanted blocked. You can use the same extension for multiple external numbers as well, assuming you have ec500 licenses.
Before I found the above method I was using vdn/vectors, but they were only useful when I wanted to block a specific number to a specific user.
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