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Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G
OL-6313-01
Chapter 2 Preparing to Install the Cisco IP Phone on Your Network
Guidelines for Configuring Ports on the Cisco IP Phone models 7902G/7905G/7912G
Redundancy Feature
For redundancy, you can use the Cisco AC adapter even if you are using inline
power from the Cisco Catalyst switches. The Cisco IP Phone can share the power
load being used from the inline power and external power source. If either the
inline power or the external power goes down, the phone can switch entirely to the
other power source.
To use this redundancy feature:
1. Set the inline power mode to auto on the Cisco Catalyst switch.
2. Connect the unpowered Cisco IP Phone to the network.
3. Connect the external power supply to the phone after the phone powers up.
Related Topics
• Connecting the Cisco IP Phone to the Network, page 3-4
• Connecting to the Network, page 2-8
• Understanding Interactions with Other Cisco IP Telephony Products,
page 2-1
• Providing Power to the Cisco IP Phone, page 2-9
Connecting a Handset to a Cisco IP Phone
Each Cisco IP Phone includes a handset designed especially for use with the
phone. These handsets are interchangeable among Cisco IP Phone models. The
handsets include a light strip used to indicate voice messages waiting.
To place and answer calls using a handset, plug the included handset into the back
of the phone base (see the “Connecting the Cisco IP Phone to the Network”
section on page 3-4 for details) and pick up the handset.