Use a Predictive Dialer on this;

1- Advice on customer service
2- Contact center technical resources
3- Networking
4- Measurements
5- Call centers
No call center is complete without a predictive dialer. They allow agents to sale or, the marketing department to market activities in large quantities. Making outgoing calls with the help of optimal SaaS software and the best of computer technology. Through a series of algorithms a good predictive dialer can predict the number of calls are answered and the availability of agents. This is done by eliminating missed calls, leased lines, voice mail and automated services.
Predictive dialer is a sequel to host auto dialer that automatically dialed numbers for agents; as well as the volume of outgoing calls depending upon the availability of agents.