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Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP and SIP)
OL-15790-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phone 7975G goes through a standard
startup process, as described in
Table 2-4
. Depending on your specific network configuration, not all of
these process steps may occur on your Cisco Unified IP Phone.
Table 2-4
Cisco Unified IP Phone Startup Process
Process Description
Related
Topics
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.
See the
“Providing Power to the
Phone” section on page 2-3
.
See the
“Resolving Startup
Problems” section on page 9-1
.
2.
Loading the Stored
Phone Image.
The Cisco Unified IP Phone 7975G 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.
See the
“Resolving Startup
Problems” section on page 9-1
.
3.
Configuring VLAN.
If the Cisco Unified IP Phone 7975G 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.
See the
“Network Configuration
Menu” section on page 4-5
.
See the
“Resolving Startup
Problems” section on page 9-1
.
4.
Obtaining an IP Address.
If the Cisco Unified IP Phone 7975G 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.
See the
“Network Configuration
Menu” section on page 4-5
.
See the
“Resolving Startup
Problems” section on page 9-1
.
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.
Note
You can also assign an alternative TFTP server to
use instead of the one assigned by DHCP.
See the
“Network Configuration
Menu” section on page 4-5
.
See the
“Resolving Startup
Problems” section on page 9-1
.
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.
Refer to
Cisco Unified
Communications Manager
Security Guide,
“Configuring
the Cisco CTL Client” chapter.
