Cisco 8821

Usage notesPurposeNetwork protocol
The phones use HTTP for XML services and for
troubleshooting purposes.
HTTP is the standard way of transferring
information and moving documents across the
Internet and the web.
Hypertext Transfer
Protocol (HTTP)
Web applications with both HTTP and HTTPS
support have two URLs configured. Phones that
support HTTPS choose the HTTPS URL.
Hypertext Transfer Protocol Secure (HTTPS) is a
combination of the Hypertext Transfer Protocol with
the SSL/TLS protocol to provide encryption and
secure identification of servers.
Hypertext Transfer
Protocol Secure
(HTTPS)
The phones implement the IEEE 802.1X standard
by providing support for the following
authentication methods: EAP-FAST and EAP-TLS.
The IEEE 802.1X standard defines a
client-server-based access control and authentication
protocol that restricts unauthorized clients from
connecting to a LAN through publicly accessible
ports.
Until the client is authenticated, 802.1X access
control allows only Extensible Authentication
Protocol over LAN (EAPOL) traffic through the
port to which the client is connected. After
authentication is successful, normal traffic can pass
through the port.
IEEE 802.1X
802.11n operates in the 2.4 GHz and 5 GHz band.
802.11ac operates in the 5 GHz band.
The IEEE 802.11 standard specifies how devices
communication over a wireless local area network
(WLAN).
IEEE 802.11n/802.11ac
To communicate using IP, network devices must
have an assigned IP address, subnet, and gateway.
IP addresses, subnets, and gateway identifications
are automatically assigned if you are using the phone
with Dynamic Host Configuration Protocol (DHCP).
If you are not using DHCP, you must manually
assign these properties to each phone locally.
The phones do not currently support IPv6.
IP is a messaging protocol that addresses and sends
packets across the network.
Internet Protocol (IP)
The phones use the RTP protocol to send and receive
real-time voice traffic from other phones and
gateways.
RTP is a standard protocol for transporting real-time
data, such as interactive voice, over data networks.
Real-Time Transport
Protocol (RTP)
RTCP is enabled by default.RTCP works in conjunction with RTP to provide
QoS data (such as jitter, latency, and round-trip
delay) on RTP streams.
Real-Time Control
Protocol (RTCP)
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
17
VoIP Networks
Network Protocols