Cold call sales overview
Cold call sales involve dropping in on prospects without an appointment, either with the objective of going for a sale, or of collecting research for a later call-back. (Or, phoning people more or less at random is another form of sales cold-calling.)
The fact is, cold-calls are usually not a good use of your time when selling. You can waste a lot of productive time waiting in reception areas for an opening to see the Decision Maker.