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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 goes through a standard startup

process, as described in

process steps may occur on your Cisco Unified IP Phone.

Table 2-4

Cisco Unified IP Phone Startup Process

Task

Purpose

Obtaining Power from the Switch.

If a phone is not using external power, the switch provides

in-line power through the Ethernet cable that is attached to

the phone.

Loading the StoredPhone Image.

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.

Configuring VLAN.

If the Cisco Unified IP Phone 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.

Obtaining an IP Address.

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.

Accessing a TFTP Server.

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.

Note

You can also assign an alternative TFTP server to

use instead of the one assigned by DHCP.

Requesting the CTL file.

The TFTP server stores the CTL file. This file contains the

certificates necessary for establishing a secure connection

between the phone and Cisco Unified Communications

Manager.

OL-23092-01

Table

2-4. Depending on your specific network configuration, not all of these

Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5

Understanding the Phone Startup Process