Cisco Systems 8.6 manual Understanding the Phone Startup Process, Purpose Related Topics

Chapter 2 Preparing to Install the Cisco Unified IP Phones on Your Network

Understanding the Phone Startup Process

Understanding the Phone Startup Process

When connecting to the VoIP network, the Cisco Unified IP Phones go through a standard startup process, 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 Startup Process
	Task	Purpose	Related Topics
1.		Obtaining Power from the Switch	• Adding Phones to the Cisco Unified
		If a phone is not using external power, the switch	Communications Manager Database, 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 Configuration Menu, page 4-5.
		If the Cisco Unified IP Phone is connected to a	• Resolving Startup Problems, page 9-1.
		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.
4.		Obtaining an IP Address	• Network Configuration Menu, page 4-5.
		If the Cisco Unified IP Phone is using DHCP to obtain	• Resolving Startup Problems, page 9-1.
		an IP address, the phone queries the DHCP server to
		obtain one. If your network does not use DHCP, you
		must assign static IP addresses to each phone locally.
5.		Accessing a TFTP Server	• Network Configuration Menu, page 4-5.
		In addition to assigning an IP address, the DHCP	• Resolving Startup Problems, page 9-1.
		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.
		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 Cisco Unified Communications Manager
		The TFTP server stores the certificate trust list (CTL)	Security Guide, Configuring the Cisco CTL Client.
		file. This file contains the certificates necessary for
		establishing a secure connection between the phone
		and Cisco Unified Communications Manager.
		Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
	OL-23091-01			2-7