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Cisco IP Telephony: Planning, Design, Implementation, Operation, and Optimization by Salman Asadullah, Ramesh Kaza

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Chapter 5. Design Phase: Network Infrastructure Design

The design phase is the second step in the planning, design, implementation, operation, and optimization (PDIOO) life cycle. Whereas Chapter 4, “Planning Phase,” discussed the best practices in designing the LAN/WAN infrastructure, this chapter provides configuration steps and sample configurations for the devices based on the XYZ, Inc. network topology and requirements. Topics in this chapter include the following:

  • Understanding call-processing architecture

  • Selecting IP Phones

  • Designing network infrastructure:

    • — Designing an IP addressing and VLAN scheme

    • — Designing DHCP/TFTP services

    • — Configuring QoS in LAN/WAN

Call-Processing Architecture

The proposed call-processing architecture for XYZ, Inc., ...

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