Maestro
Its from Vector Marketing.
As a general policy sales people are told to never leave messages. especially to individuals who they haven't had previous dealings with.
because...
1. Its generally makes people angry when solicitors leave messages.
2. because it gives you the chance to block their number BEFORE they get a chance to pitch you on their product.
3. Because if they have made a mistake, and your names on the national DO NOT CALL REGISTRY, its leaves solid proof that they actually called.