Call Blockers

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Block unwanted calls with our range of call barring devices. Stop cold callers and nuisance sales calls in their tracks, block their numbers so they can't bother you again. Imagine knowing that when your phone rings, it's someone you want to talk to. DST's collection of call barring products includes the massively popular CPR call blocker, the TrueCall screening products and selected products that aid call barring for the elderly.