Cisco 7821 Administration Manual page 22

Supported Network Protocols
Power Save
Power Save Plus (EnergyWise)
Related Topics
Schedule Power Save Plus (EnergyWise) on Cisco IP Phone, on page 115
Schedule Power Save for Cisco IP Phone, on page 113
Supported Network Protocols
Cisco IP Phones support several industry-standard and Cisco network protocols required for voice
communication. The following table provides an overview of the network protocols that the Cisco IP Phone
7821, 7841, and 7861 support.
Table 5: Supported Network Protocols on the Cisco IP Phone
Network protocol
Bootstrap Protocol (BootP)
Cisco Audio Session
Tunneling (CAST)
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
8
In Power Save mode, the backlight on the screen is not lit when the phone is not in use. The phone
remains in Power Save mode for the scheduled duration or until the user lifts the handset or presses
any button.
Set up each phone to enable or disable Power Save settings. You can configure the phones to dim the
backlight on a schedule.
The Cisco IP Phone supports Cisco EnergyWise (Power Save Plus) mode. When your network contains
an EnergyWise (EW) controller (for example, a Cisco switch with the EnergyWise feature enabled),
you can configure these phones to sleep (power down) and wake (power up) on a schedule to further
reduce power consumption.
Set up each phone to enable or disable the EnergyWise settings. If EnergyWise is enabled, configure
a sleep and wake time, as well as other parameters. These parameters are sent to the phone as part of
the phone configuration XML file.
Purpose
BootP enables a network device such as
the Cisco IP Phone to discover certain
startup information, such as its IP address.
The CAST protocol allows IP phones and
associated applications behind the phone
to discover and communicate with the
remote endpoints without requiring
changes to the traditional signaling
components like Cisco Unified
Communications Manager and gateways.
The CAST protocol allows separate
hardware devices to synchronize related
media and it allows PC applications to
augment nonvideo-capable phones to
become video enabled using the PC as
the video resource.
Usage notes
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