The invention is an algorithm that allows a service provider to differentiate dialer traffic from conversational traffic and to divert the dialer traffic and/or to block or release it, enabling the routing of dialer calls only to those carriers that offer favorable rate conditions for dialer traffic and conversational calls to another larger superset of least cost routing carriers. Additionally, the invention allows the service provider to block the dialer type traffic, in which case the algorithm returns a “release-back” code.