Chapter 2. Traditional Telephony

THE FOLLOWING CCNA VOICE EXAM OBJECTIVES ARE COVERED IN THIS CHAPTER:

  • Describe PSTN components and technologies.

    • Describe the services provided by the PSTN.

    • Describe time division and statistical multiplexing.

    • Describe supervisory, informational, and address signaling.

    • Describe numbering plans.

    • Describe analog circuits.

    • Describe digital voice circuits.

    • Describe PBX, trunk lines, key-systems, and tie lines.

  • Describe VoIP components and technologies.

    • Describe the process of voice packetization.

  • Describe the components of the Cisco Unified Communications Architecture.

    • Describe the function of auto attendants and IVRs in a UC environment.

We'll first discuss analog signaling and the different signaling functions each type performs. ...

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