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The IP phone communicates with the switch, using the Cisco Discovery Protocol (CDP), to request the voice VLAN if present. With IP phones residing in a separate VLAN-a voice VLAN-it is easier for you to automate the process of deploying IP phones. Use new subnets for Cisco IP phones if they are available in the existing address space, or use private addressing such as the 10.0.0.0 network (see RFC 1918 for details) if subnets are not available in the existing address space.Add Cisco IP phones and use DHCP to provision IP addresses and operating parameters.Continue to use existing addressing for data devices (PCs, workstations, and so on).The following are IP addressing recommendations when adding Cisco IP phones to an existing data network: This separation allows you to handle each traffic type individually, applying different quality of service (QoS) policies to each VLAN for monitoring and managing them separately. Voice and data VLANs allow the logical separation of data and voice traffic due to different characteristics.A separate VLAN and its separate IP subnet to carry the voice traffic allow a large number of new devices, such as IP phones, to be introduced into the network without extensive modifications to the existing IP address scheme. IP subnets usually have more than 50 percent-and often more than 80 percent-of their IP addresses allocated. Cisco IP phones can be deployed on the network without IP address scalability problems.The benefits of this type of configuration include the following: Figure 7.1 illustrates how the Cisco IP phone acts as a three-port switch.Д¬isco IP phone switch ports do not support Inter-Switch Link (ISL) encapsulation, only 802.1Q. Just like a switch, the phone can support 802.1Q frames between itself and another switch, and more than one VLAN can be supported between the Cisco Unified IP phone and an access switch. Understanding the Theory of Voice VLANsДЄ Cisco IP phone can act as a three-port switch. This chapter describes the typical boot process for Cisco IP phones and indicates the best practices related to configuring the network to support Voice over IP (VoIP). To deploy Cisco Unified Communications Manager Express, network services need to be established and properly configured on all routers and switches for Cisco IP phones to function. Identify the XML configuration files and understand their use Understand the Cisco IP phone bootup process Understand how CDP is used in Cisco VoIP solutionsД¬reate DHCP scopes on the Cisco IOS router platformД¬onfigure DHCP relay on the Cisco IOS router platform

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