Cisco Systems 6921 manual Understanding the Phone Startup Process, Purpose Related Topics

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	• 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 Setup Menu, page 4-4.
	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 you are not using DHCP in your
	network, you must assign static IP addresses to each
	phone locally.
5.	Accessing a TFTP Server	• Network Setup Menu, page 4-4.
	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 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)

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