Cisco 7945G Administration Guide

2-5
Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.1(3)
OL-17755-01
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Phone Configuration Files
Power Outage
Your accessibility to emergency service through the phone is dependent on the phone being powered. If
there is an interruption in the power supply, Service and Emergency Calling Service dialing will not
function until power is restored. In the case of a power failure or disruption, you may need to reset or
reconfigure equipment before using the Service or Emergency Calling Service dialing.
Obtaining Additional Information about Power
For related information about power, refer to the documents shown in Table 2-3. These documents
provide information about these topics:
• Cisco switches that work with the Cisco Unified IP Phone 7965G and 7945G
• The Cisco IOS releases that support bidirectional power negotiation
• 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 automatically made to the
phone’s configuration file.
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 protocol in the phone
configuration file be set to TLS, which corresponds to the transport type in the SIP Security Profile in
Cisco Unified Communications Manager Administration.
Ta b l e 2-3 Related Documentation for Power
Document Topics URL
Cisco Unified IP Phone Power
Injector
http://http://www.cisco.com/en/US/products/ps6951/index.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/ps708/tsd_pro
ducts_support_series_home.html
Integrated Service Routers http://www.cisco.com/en/US/products/hw/routers/index.html
Cisco IOS Software http://www.cisco.com/en/US/products/sw/iosswrel/products_ios_ci
sco_ios_software_category_home.html

Cisco 7945G Specifications

General

Brand	Cisco
Model	7945G
Category	IP Phone
Language	English