Understanding The Phone Startup Process - Cisco 7945G Administration Manual

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 7965G and 7945G goes through a
standard startup process, as described in
not all of these process steps may occur on your Cisco Unified IP Phone.
Table 2-4 Cisco Unified IP Phone Startup Process
Configuration Step and Description
Step 1
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.
Step 2
Loading the Stored Phone Image.
The Cisco Unified IP Phone 7965G and 7945G 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.
Step 3 Configuring VLAN.
If the Cisco Unified IP Phone 7965G and 7945G 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.
Step 4
Obtaining an IP Address.
If the Cisco Unified IP Phone 7965G and 7945G 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.
Step 5
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.
You can also assign an alternative TFTP server to use instead of the
Note
one assigned by DHCP.
Step 6 Requesting the CTL file.
The TFTP server stores the certificate trust list (CTL) file. This file contains
a list of Cisco Unified Communications Managers and TFTP servers that the
phone is authorized to connect to. It also contains the certificates necessary
for establishing a secure connection between the phone and Cisco Unified
Communications Manager.
Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.1(3)
OL-17755-01
Understanding the Phone Startup Process
Table 2-4. Depending on your specific network configuration,
Related Topics
See the
Phone" section on page
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section on page
See the
section on page
See the
Menu" section on page
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section on page
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Menu" section on page
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Menu" section on page
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Refer to Cisco Unified
Communications Manager Security
Guide, "Configuring the Cisco CTL
Client" chapter.
"Providing Power to the
2-3.
"Resolving Startup Problems"
9-1.
"Resolving Startup Problems"
9-1.
"Network Configuration
4-5.
"Resolving Startup Problems"
9-1.
"Network Configuration
4-5.
"Resolving Startup Problems"
9-1.
"Network Configuration
4-5.
"Resolving Startup Problems"
9-1.
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