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I *think* they do as the CLI should be standard but I'm not 100%. Q&As on the amazon page suggests they do (http://amzn.to/2aMU07o)

There are three types of call: Blocked, Allowed and Unknown. Blocked will be hung up on by the machine and you wont know. Allowed will ring all phones. Unknown will be answered by the call guardian and the caller is offered the opportunity to announce themselves; if they do, then the guardian...

I bought a BT8600 call blocking phone and I haven't had a single cold call since. Marvellous bit of kit.