Cisco CP-7940G-CH1 Administration Guide - Page 36
Understanding the Phone Startup Process - power over ethernet
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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 7960G and 7940G go through a standard startup process that is described in Table 2-3. Depending on your specific network configuration, not all of these steps may occur on your Cisco Unified IP Phone. Table 2-3 Cisco Unified IP Phone 7960G and 7940G Startup Process Task Description Related Topics 1. Obtain power from the switch. • Adding Phones to the Cisco If a phone is not using external power, the switch provides in-line power through the Ethernet cable attached to the Unified Communications Manager Database, page 2-7. phone. • Resolving Startup Problems, page 8-1. 2. Load the stored phone image. Resolving Startup Problems, page 8-1. 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. 3. Configure the VLAN. • Network Configuration Menu, page 4-4. If the Cisco Unified IP Phone is connected to a Cisco Catalyst switch, the switch next informs the phone of the voice VLAN defined on the switch. The phone needs to know its VLAN membership before it can proceed with the Dynamic Host Configuration Protocol (DHCP) request for an IP address. • Resolving Startup Problems, page 8-1. 4. Obtain an IP address. • Network Configuration Menu, page 4-4. 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. • Resolving Startup Problems, page 8-1. 5. Access a TFTP server. • Network Configuration Menu, page 4-4. 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. • Resolving Startup Problems, page 8-1. Note You can also assign an alternative TFTP server to use instead of the one assigned by DHCP. 6. Request the CTL file. For more information, refer to the Cisco The TFTP server stores the certificate trust list (CTL) file. Unified Communications Manager Security Guide 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. Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP) 2-6 OL-15498-01