Cisco 6941 Administration Guide - Page 49

Chapter Understanding the Phone Startup Process Understanding the Phone Startup Process When connecting to the VoIP network, the Cisco Unified IP Phone 6921, 6941, and 6961 go through a standard startup process that is described in Table 2-3. Depending on your specific network setup, not all of these steps may occur on your Cisco Unified IP Phone. Table 2-3 Cisco Unified IP Phone Startup Process Task Purpose Related Topics 1. Obtaining Power from the Switch • Adding Phones to the Cisco Unified CM Database, If a phone is not using external power, the switch page 2-8. provides in-line power through the Ethernet cable • Resolving Startup Problems, page 9-1. attached to the phone. 2. Loading the Stored Phone Image Resolving Startup Problems, page 9-1. 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. Configuring VLAN • Network Setup 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 9-1. 4. Obtaining an IP Address • Network Setup 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 9-1. 5. Accessing a TFTP Server • Network Setup 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 9-1. Note You can also assign an alternative TFTP server to use instead of the one assigned by DHCP. 6. Requesting the CTL file Refer to the Cisco Unified Communications Manager The TFTP server stores the certificate trust list (CTL) Security Guide, "Configuring the Cisco CTL Client" file. The CTL file contains the certificates necessary chapter. for establishing a secure connection between the phone and Cisco Unified CM. Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP) OL-23769-01 2-7