Cisco Systems OL-23089-01 manual Understanding the Phone Startup Process

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

Understanding the Phone Startup Process

For more information about how the phone interacts with the TFTP server, see the Cisco Unified Communications Manager System Guide, Cisco TFTP.

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 Table 2-2. Depending on your network configuration, not all of these process steps may occur on your Cisco Unified IP Phone.

Table 2-2

Cisco Unified IP Phone Startup Process

 

 

 

 

 

 

No.

Process

 

Description

Related Topics

 

 

 

 

1.

Obtaining Power from the

If a phone is not using external power, the switch

See Providing Power to the

 

Switch.

 

provides in-line power through the Ethernet cable that is

Phone, page 2-3.

 

 

 

attached to the phone.

See Resolving Startup Problems,

 

 

 

 

 

 

 

 

page 9-1.

 

 

 

 

2.

Loading the Stored

The Cisco Unified IP Phone has non-volatile flash

See Resolving Startup Problems,

 

Phone Image.

memory in which it stores firmware images and

page 9-1.

 

 

 

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.

If the Cisco Unified IP Phone is connected to a Cisco

See Network Configuration

 

 

 

switch, the switch next informs the phone of the voice

Menu, page 3-6.

 

 

 

VLAN defined on the switch port. The phone needs to

See Resolving Startup Problems,

 

 

 

know its VLAN membership before it can proceed with

 

 

 

page 9-1.

 

 

 

the DHCP request for an IP address.

 

 

 

 

 

4.

Obtaining an IP Address.

If the Cisco Unified IP Phone is using DHCP to obtain an

See Network Configuration

 

 

 

IP address, the phone queries the DHCP server to obtain

Menu, page 3-6.

 

 

 

one. If you are not using DHCP in your network, you

See Resolving Startup Problems,

 

 

 

must assign static IP addresses to each phone locally.

 

 

 

page 9-1.

 

 

 

 

 

 

 

 

5.

Accessing a TFTP Server.

In addition to assigning an IP address, the DHCP server

See Network Configuration

 

 

 

directs the Cisco Unified IP Phone to a TFTP Server. If

Menu, page 3-6.

 

 

 

the phone has a statically defined IP address, you must

See Resolving Startup Problems,

 

 

 

configure the TFTP server locally on the phone; the

 

 

 

page 9-1.

 

 

 

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.

The TFTP server stores the CTL file. This file also

See the Cisco Unified

 

 

 

contains the certificates necessary for establishing a

Communications Manager

 

 

 

secure connection between the phone and Cisco

Security Guide, Configuring the

 

 

 

Unified CM.

Cisco CTL Client.

 

 

 

 

 

Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)

2-6

OL-23089-01

 

 

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Contents A P T E R Telephony Features Available for the Phone, Related TopicProviding Power to the Phone Power OutageRelated Topics Power Guidelines Obtaining Additional Information about PowerPower Type Guidelines Understanding Phone Configuration Files Understanding the Phone Startup Process Process Description Related TopicsAdding Phones to Cisco Unified CM DefaultConfiguration Files, See Understanding PhoneAdding Phones with Auto-Registration RequiresMethod Address? Adding Phones with Cisco Unified CM Administration Adding Phones with Auto-Registration and TapsUsing Cisco Unified IP Phones with Different Protocols ProcedureAdding Phones with BAT Deploying a Phone in an Sccp and SIP Environment See Configuring Startup Network Settings,Converting a New Phone from Sccp to SIP Deploying a Phone in an Sccp and SIP Environment,Determining the MAC Address of a Cisco Unified IP Phone