Cisco 7975G - Understanding the Phone Startup Process

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Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.0
OL-12642-01
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 Step 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.