They are leads that have been generated by calling a bank of numbers with a prerecorded message. The message would offer the recipient a chance to be connected directly with an agent simply by pressing a digit on the phone pad.
Leads generated through voice broadcasting solution are cheaper...
There are lots of cloud contact center software specifically for call centers, but the effectiveness all comes back to the features of the one you choose.
Deployment ease
Scalability
Proactive engagement
Analytics and reporting capabilities
Easy workforce management
Mobile application...