The Digitone blocker blocks all these:The Digitone Call Blocker 10 works in Mexico, Canada and with all U.S. phone companies with standardized phone lines, DSL, Cable modems or VoIP phone service adapters, like FIOS, Vonage, Skype, Magic Jack, Ooma and Cell Phone Gateways.
So I don't think you need to worry about what phone system you got.