PDF of this tutorialConverged networks are actually composed of two separate networks: a TDM or voice network, and an asynchronous transfer mode (ATM), frame, IP, or data network. What makes a converged network work is the ability to control both networks from one platform simultaneously while being able to manage call-control and multiple protocols from different switch applications. The way to achieve convergence is through an open programmable architecture that accesses API libraries to control various interdependencies. For instance, suppose a customer wants to dial a client in another region of the country. According to today’s terms, it usually means dialing a 10-digit number that routes out of band (SS7) to its destination. In a converged network, the call would route into a host facility via SS7 A-links, where the host would first check for validation and provide a branded prompt recording, receive the listed directory number (LDN), and route the call via least-cost routing methods to its destination. Based on costs, the call could route out a packet-switched gateway into an ATM cloud to the distance end, where another gateway would receive the call and send it via PSTN to its destination. This routing architecture cuts out the cost of the transcontinental connection.
