Understanding phone configuration files – Cisco OL-11953-01 User Manual

Page 8

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Understanding Phone Configuration Files

2-8

Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.0

OL-11953-01

•

Other requirements and restrictions regarding power

Understanding Phone Configuration Files

Configuration files for a phone are stored on the TFTP server and define
parameters for connecting to Cisco Unified Communications Manager. In
general, any time you make a change in Cisco Unified Communications Manager
that requires the phone to be reset, a change is made to the phone’s configuration
file automatically.

Configuration files also contain information about which image load the phone
should be running. If this image load differs from the one currently loaded on a
phone, the phone contacts the TFTP server to request the required load files.
(These files are digitally signed to ensure the authenticity of the files’ source.)

In addition, if the device security mode in the configuration file is set to
Authenticated and the CTL file on the phone has a valid certificate for
Cisco Unified Communications Manager, the phone establishes a TLS connection
to Cisco Unified Communications Manager. Otherwise, the phone establishes a
TCP connection. For SIP phones, a TLS connection requires that the transport

Table 2-3

Related Documentation for Power

Document Topics

URL

Cisco Unified IP Phone
Power Injector

http://www.cisco.com/en/US/products/hw/phones/p
s379/prod_installation_guides_list.html

PoE Solutions

http://www.cisco.com/en/US/netsol/
ns340/ns394/ns147/ns412/networking_solutions_
package.html

Cisco Catalyst Switches

http://www.cisco.com/en/US/products/hw/switches/
tsd_products_support_category_home.html

Integrated Service
Routers

http://www.cisco.com/en/US/products/hw/routers/
index.html