Chapter 14. PSTN and VoIP Interworking
The previous chapters described public switched telephone network (PSTN) and various Voice over IP (VoIP) technologies in isolation from one another. In real-world carrier networks, VoIP and PSTN technologies coexist and will continue to do so for some years to come. This chapter describes alternatives for interworking between VoIP and PSTN.
Cisco Packet Telephony
The Cisco Packet Telephony architecture is based on 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 ...
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