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Chapter 2
Preparing to Install the Cisco Unified IP Phones on Your Network
Obtaining Additional Information about Power
For related information about power, refer to the documents shown in
provide information about the following topics:
•
•
•
Table 2-2
Document Topics
Cisco Unified IP Phones Power
Injector
PoE Solutions
Cisco Catalyst Switches
Integrated Service Routers
Cisco IOS Software
Understanding Phone Configuration Files
Phone configuration files 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 load 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.
If the device security mode in the configuration file is set to Authenticated or Encrypted, but the phone
Note
has not received a CTL or ITL file, the phone tries four times to obtain the file so it can register securely.
Cisco Extension Mobility Cross Cluster is an exception, in that the phone permits a TLS connection to
Note
Cisco Unified Communications Manager for secure signaling even without the CTL file.
OL-23091-01
Cisco switches that work with the Cisco Unified IP Phones
The Cisco IOS releases that support bidirectional power negotiation
Other requirements and restrictions regarding power
Related Documentation for Power
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
URL
http://www.cisco.com/en/US/products/ps6951/index.html
http://www.cisco.com/en/US/netsol/ns340/ns394/ns147/ns412/net
working_solutions_package.html
http://www.cisco.com/en/US/products/hw/switches/ps708/tsd_prod
ucts_support_series_home.html
http://www.cisco.com/en/US/products/hw/routers/index.html
http://www.cisco.com/en/US/products/sw/iosswrel/products_ios_
cisco_ios_software_category_home.html
Understanding Phone Configuration Files
Table
2-2. These documents
2-5
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Troubleshooting
