Cisco 7960 Administrator's Manual page 36

Initialization Process Overview
During the initialization process, the following events take place:
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Cisco SIP IP Phone 7960 Administrator Guide
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The stored image is loaded.
The Cisco SIP IP phone has non-volatile Flash memory in which it stores the
firmware images, user-defined preferences, and permanent factory
information about the phone.
During initialization, the phone runs a bootstrap loader that loads and
executes the phone image stored in Flash memory.
The VLAN is configured.
If the Cisco SIP IP phone is connected to a Catalyst switch, the switch notifies
the phone of the voice VLAN defined on the switch. The phone needs to know
its VLAN membership before it can proceed with the DHCP request for its IP
settings (if using DHCP).
An IP address is acquired.
If the Cisco SIP IP phone is using DHCP to obtain the IP settings, the phone
queries the DHCP server. If the phone is not using DHCP, then the phone will
use IP settings that are stored in Flash memory.
The TFTP server is contacted.
On the TFTP server is the latest Cisco SIP IP phone firmware image and the
dual boot file (OS79XX.TXT) that enables the phone to automatically
determine and initialize for the VoIP environment in which it is being
installed.
If the phone is using the TFTP server to obtain its SIP parameters, there
should also be a configuration file or files on the TFTP server that the phone
will request and download. In the configuration file or files, SIP parameters
that are required by the phone to operate in a SIP VoIP environment are
defined. If the phone is not obtaining its SIP parameters via the TFTP server,
the phone will use SIP settings that are stored in Flash memory.
The firmware version is verified.
If the phone is obtaining its SIP parameters via a TFTP server, the
configuration files are requested. If the phone determines that the image
defined in a configuration file differs from the image it has stored in Flash
memory, it performs a firmware upgrade.
When performing a firmware upgrade, the phone downloads the firmware
image from the TFTP server, programs the image into Flash memory, and
reboots.
Chapter 2 Getting Started with Your Cisco SIP IP Phone
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