One customer study showed 80% of large deals (>400K) closed from a tactical cold calling programs. An accident? No
Companies that outsource/hire often look for the economy option because the stakeholder personally doesn't like getting calls, so they don't want to invest a lot in their call campaign, which actually ensures they have bad calls made on their behalf.
Measuring the results of actual made by people that know what they are talking about still show it is the #1 highest resulting activity companies can do.