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Chapter 13. Virtual Switch Controller > Open Packet Telephony
Open Packet Telephony
Cisco's Open Packet Telephony (OPT) architecture is based upon the creation of three logical planes: connection control, call control, and services. Each plane represents a different functional aspect of a voice service and interacts with the other logical planes through well-defined open interfaces. The three planes are organized into a hierarchy, with connection control at the lowest level, call control above connection control, and services above call control. Figure 13-1 illustrates the functional composition of the OPT architecture.
Figure 13-1. Open Packet Telephony Architecture
