Cisco 7975G Administration Guide - Page 45

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network Understanding the Phone Startup Process Understanding the Phone Startup Process When connecting to the VoIP network, the Cisco Unified IP Phone 7975G 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. 5. Accessing a TFTP Server. 6. Requesting the CTL file. 7. Requesting the Configuration File. 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 2-3. See the "Resolving Startup Problems" section on page 9-1. The Cisco Unified IP Phone 7975G 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 9-1. If the Cisco Unified IP Phone 7975G 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 4-5. See the "Resolving Startup Problems" section on page 9-1. If the Cisco Unified IP Phone 7975G 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 4-5. See the "Resolving Startup Problems" section on page 9-1. In addition to assigning an IP address, the DHCP server directs the Cisco Unified IP Phone to a TFTP Server. If the phone has a statically defined IP address, you must configure the TFTP server locally on the phone; the phone then contacts the TFTP server directly. See the "Network Configuration Menu" section on page 4-5. See the "Resolving Startup Problems" section on page 9-1. Note You can also assign an alternative TFTP server to use instead of the one assigned by DHCP. The TFTP server stores the certificate trust list (CTL) file. This file contains a list of Cisco Unified Communications Managers and TFTP servers that the phone is authorized to connect to. It also contains the certificates necessary for establishing a secure connection between the phone and Cisco Unified Communications Manager. Refer to Cisco Unified Communications Manager Security Guide, "Configuring the Cisco CTL Client" chapter. The TFTP server has configuration files, which define parameters for connecting to Cisco Unified Communications Manager and other information for the phone. See the "Understanding Phone Configuration Files" section on page 2-5. See the "Resolving Startup Problems" section on page 9-1. OL-14640-01 Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.1 2-7