Specifications

Chapter 2 An Overview of the Voice Over IP Wireless Network
Components of the VoIP Wireless Network
2-10
Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0
OL-10802-02
Internet Protocol (IP) Messaging protocol that addresses
and sends packets across the
network.
To communicate using IP, network
devices must have an assigned IP
address, subnet, and gateway.
IP addresses, subnet, and gateway
identifications are automatically
assigned if you are using the Cisco
Unified
IP Phone with DHCP. If you
are not using DHCP, you must
manually assign these properties to
each phone locally.
Light Extensible
Authentication Protocol
(LEAP)
Cisco proprietary password-based
mutual authentication scheme
between the client (phone) and a
RADIUS server.
Cisco Unified Wireless
IP
Phone 7921G can use LEAP for
authentication with the wireless
network.
Power Save Poll
(PS-Poll)
Allows the phone to be in power save
mode yet receive queued packets
from AP.
Cisco Unified Wireless
IP
Phone 7921G can use PS-Poll to
preserve battery life.
Real-Time Control
Protocol (RTCP)
Used with the RTP protocol to
provide control over the transporting
of real-time data, such as interactive
voice and video, over data networks.
Cisco Unified IP Phones use the
RTCP protocol to allow monitoring
of the data delivery and minimal
control and identification
functionality.
Real-Time Transport
(RTP)
Standard for transporting real-time
data, such as interactive voice and
video, over data networks.
Cisco Unified IP Phones use the RTP
protocol to send and receive
real-time voice traffic from other
phones and gateways.
Skinny Client Control
Protocol (SCCP)
Uses Cisco-proprietary messages to
communicate between IP devices and
Cisco Unified CallManager.
Cisco Unified IP Phones use SCCP
protocol for VoIP call signaling and
enhanced features such as Message
Waiting Indication (MWI).
Temporal Key Integrity
Protocol (TKIP) with
message integrity check
(MIC)
Encryption and data integrity
protocol that encrypts data sent over
the wireless LAN.
Cisco Unified Wireless
IP
Phone 7921G can use TKIP/MIC
algorithms to secure and preserve the
integrity of voice communications.
Table 2-3 Supported Networking Protocols on the Cisco Unified Wireless IP Phone 7921G
Networking Protocol Purpose Usage Notes