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Chapter 2. Planning, Design, Implementation, Operation, and Optimization Overview
The first chapter should have given you an understanding of the evolution of data and voice networks and the various components of IP telephony (IPT) networks. IPT merges separate voice and data networks into a single, converged network. This change requires fine-tuning the existing network infrastructure.To facilitate a successful IPT rollout in an organization, you should follow the planning, design, implementation, operation, and optimization (PDIOO) methodology. This widely accepted procedure, outlined in this chapter, ensures the smoothest, most efficient path to a successful IPT deployment. In fact, the best practice is to follow the PDIOO methodology while deploying any new technology. Technologies that are deployed without following the PDIOO methodology usually end up in broken, unscalable, and unoptimized networks. To avoid the time delays that increase the total cost of the project, make a decision from day one to follow the PDIOO methodology while deploying IPT.As a network design engineer who is engaged in the PDIOO of IPT networks, you should have a solid understanding of packetized voice technology, voice products, TDM network inter-actions, and IPT technology and components.This chapter discusses each stage in the PDIOO methodology and explains how this approach can help you to achieve your goals and smoothly migrate the legacy telephony network to an IPT network. Figure 2-1 shows the complete PDIOO methodology to deploy the IPT network and various subtasks within each phase.
Figure 2-1. PDIOO Methodology for Deploying IPT Solution
Chapter 3, "Large-Scale Enterprise Requirements for IP Telephony," presents the sample RFP (this task is shown in dotted lines in Figure 2-1) for a fictitious customer, XYZ, Inc. The subsequent chapters in this book cover the various tasks shown in Figure 2-1 within the PDIOO phases to roll out IPT at XYZ, Inc. Figure 2-1 shows the PDIOO tasks for deploying the IPT solution in the dotted lines. Note that Figure 2-1 shows the ommonly followed tasks to deploy IPT by following the PDIOO methodology. However, depending on the type of the business and requirements, you might have to add extra tasks within each phase.
