Network Protocols - Cisco 8821 Administration Manual

Network Protocols

The phone displays the date and time from Cisco Unified Communications Manager. If the user turns off
Note
Automatic date and time in the Settings application, the time may become out of sync with the server
time.
Network Protocols
The Cisco Wireless IP Phone 8821 and 8821-EX supports several industry-standard and Cisco network
protocols required for voice communication. The following table provides an overview of the network protocols
that the phones support.
Table 2: Supported Network Protocols
Network protocol Purpose
Bluetooth Bluetooth is a wireless personal area network
(WPAN) protocol that specifies how devices
communicate over short distances.
Bootstrap Protocol BootP enables a network device, such as the Cisco
(BootP) IP Phone, to discover certain startup information,
such as the IP address.
Cisco Audio Session The CAST protocol allows Cisco IP Phones and
Tunnel (CAST) associated applications to discover and communicate
with the remote IP Phones without requiring changes
to the traditional signaling components, such as
Cisco Unified Communications Manager (CM) and
gateways.
Cisco Peer-to-Peer CPPDP is a Cisco proprietary protocol used to form
Distribution Protocol a peer-to-peer hierarchy of devices. This hierarchy
(CPPDP) is used to distribute firmware files from peer devices
to their neighboring devices.
Dynamic Host DHCP dynamically allocates and assigns an IP
Configuration Protocol address to network devices.
(DHCP)
DHCP enables you to connect an IP phone into the
network and the phone to become operational
without the need to manually assign an IP address
or to configure additional network parameters.
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
16
Usage notes
The phones support Bluetooth 4.0.
—
The phones use CAST as an interface between
CUVA and Cisco Unified Communications Manager
using the Cisco IP Phone as a SIP proxy.
CPPDP is used by the Peer Firmware Sharing
feature.
DHCP is enabled by default. If disabled, you must
manually configure the IP address, subnet mask,
gateway, and a TFTP server on each phone locally.
We recommend that you use DHCP custom option
150. With this method, you configure the TFTP
server IP address as the option value. For more
information, see the documentation for your
particular Cisco Unified Communications Manager
release.
If you cannot use option 150, you may try
Note
using DHCP option 66.
VoIP Networks