Understanding The Phone Startup Process - Cisco 7975G Software 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 7975G goes through a standard
startup process, as described in
these process steps may occur on your Cisco Unified IP Phone.
Table 2-4 Cisco Unified IP Phone Startup Process
Process
Obtaining Power from the
1.
Switch.
Loading the Stored
2.
Phone Image.
3. Configuring VLAN.
Obtaining an IP Address.
4.
5. Accessing a TFTP Server. In addition to assigning an IP address, the DHCP server
Requesting the CTL file. The TFTP server stores the certificate trust list (CTL)
6.
Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP and SIP)
OL-15790-01
Table
Description
If a phone is not using external power, the switch
provides in-line power through the Ethernet cable that is
attached to the phone.
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.
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.
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.
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
Note
use instead of the one assigned by DHCP.
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.
2-4. Depending on your specific network configuration, not all of
Understanding the Phone Startup Process
Related Topics
See the "Providing Power to the
Phone" section on page
See the "Resolving Startup
Problems" section on page
See the "Resolving Startup
Problems" section on page
See the "Network Configuration
Menu" section on page
See the "Resolving Startup
Problems" section on page
See the "Network Configuration
Menu" section on page
See the "Resolving Startup
Problems" section on page
See the "Network Configuration
Menu" section on page
See the "Resolving Startup
Problems" section on page
Refer to Cisco Unified
Communications Manager
Security Guide, "Configuring
the Cisco CTL Client" chapter.
2-3.
9-1.
9-1.
4-5.
9-1.
4-5.
9-1.
4-5.
9-1.
2-7