There’s people here who created some custom rules to enhance their blacklist, like importing from public spam lists etc.
Regarding routing based on CID, see this post.
Also, Lorne’s post seems more elegant.
We wanted to route calls if it has “AA:” to a different destination (We added the “AA:” as a prefix)
Your “V” calls seems all to start with “V21” is thats the case then maybe you should to something like [${check} != "V21"]
Routing these calls to a IVR rather than a blacklist would be a good idea, in case there’s a human at the other end… (You can maybe set the timeout destination in the IVR to blacklist…)
Much luck.