This section introduces the traditional telephony infrastructure and explains its major components. It describes analog and digital signaling and the process to convert between the two. PBX and Public Switched Telephone Network (PSTN) switches are described and contrasted. The telephone infrastructure and connections between telephony devices are examined. Telephony signaling mechanisms are described, and PSTN numbering plans are explained.
NOTE We examine traditional telephony in this section to better understand the features and services that must be provided on a converged network.
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