We have a product called SecureLogix that is inline to a few PRI lines that terminate to the CUBE router. It performs some basic call reporting and helps filter out spam calls. The version of SecuireLogix that we run is very old. We are planning to move away from PRI to SIP and wondering if there are better tools that helps with filtering spam calls even before calls hit the CUBE router.
Mutare is another option specific to spam calls, although I’m not in a position to rank them vs. SecureLogix. Last I spoke with them, their deployment was a bit messy needing three different VMs with, IIRC, three different GNU/Linux distros though.
I have also been trying IntelePeer’s CPaaS Smart Flow flow to do this carrier-side but it’s too early to tell the effectiveness.