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Chapter 3. Large-Scale Enterprise Requirements for IP Telephony
The first two chapters provided an overview of the Cisco IP telephony (IPT) solution, a brief introduction to the various components and protocols involved in an IPT network, and a tutorial on the planning, design, implementation, operation, and optimization (PDIOO) methodology to deploy IPT networks. The customer requirements provided in this chapter are used as the basis for the planning activities described in this book.In this chapter, we consider a large-scale customer named XYZ, Inc., which is pursuing a Cisco IPT solution to replace its existing PBX systems as part of an emerging technology deployment project. The goal of this project is to establish a reliable, manageable, integrated, and scalable IPT solution that meets or exceeds the capabilities of the current voice network that is deployed with the legacy PBX systems.To achieve this goal as a network engineer, you need to study the existing data, legacy voice network infrastructure and understand the customer's network requirements for the IPT project. This information will help you to properly design the IPT network and enable the infrastructure to carry the integrated data/voice/video traffic smoothly.The information presented in this chapter is used in subsequent chapters to guide you through the various tasks in the PDIOO methodology, which can help you to deploy IPT in real-world networks. The idea here is not to discuss complex networks and confuse you with a lot of requirements. Instead, you will build the IPT network for XYZ, Inc. with commonly deployed IPT features and applications. You will be able to use the basic principles and design techniques discussed in this book to customize or add more applications to meet your IPT network requirements.This chapter also serves as a reference to voice architecture teams that are tasked to write a Request for Proposal (RFP). It gives guidance as to what needs to go into the RFP so that IPT product vendors can respond with their proposed architectures.Customer Profile" and "Customer Requirements" sections in this chapter is usually provided by customers in the form of an RFP. If you are a network engineer who is responsible for the IPT network design and you do not have this information, you must collect it prior to starting any tasks described in the PDIOO methodology by meeting with the voice network architecture group in the customer organization.
