Cisco 7970G Administration Guide - Page 62

Understanding the Phone Startup Process Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network Understanding the Phone Startup Process When connecting to the VoIP network, the Cisco Unified IP Phone goes through a standard startup process, as described in Table 2-4. Depending on your specific network configuration, not all of these process steps may occur on your Cisco Unified IP Phone. Table 2-4 Cisco Unified IP Phone Startup Process Process Step 1. Obtaining Power from the Switch. 2. Loading the Stored Phone Image. 3. Configuring VLAN. 4. Obtaining an IP Address. Description Related Topics If a phone is not using external power, the switch provides in-line power through the Ethernet cable that is attached to the phone. See the "Providing Power to the Phone" section on page 2-4. See the "Resolving Startup Problems" section on page 9-2. The Cisco Unified IP Phone has non-volatile flash memory in which it stores firmware images and user-defined preferences. At startup, the phone runs a bootstrap loader that loads a phone image stored in flash memory. Using this image, the phone initializes its software and hardware. See the "Resolving Startup Problems" section on page 9-2. If the Cisco Unified IP Phone is connected to a Cisco switch, the switch next informs the phone of the voice VLAN defined on the switch port. The phone needs to know its VLAN membership before it can proceed with the Dynamic Host Configuration Protocol (DHCP) request for an IP address. See the "Network Configuration Menu" section on page 4-7. See the "Resolving Startup Problems" section on page 9-2. If the Cisco Unified IP Phone is using DHCP to obtain an IP address, the phone queries the DHCP server to obtain one. If you are not using DHCP in your network, you must assign static IP addresses to each phone locally. See the "Network Configuration Menu" section on page 4-7. See the "Resolving Startup Problems" section on page 9-2. 2-10 Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1 OL-14626-01