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Cisco Wireless IP Phone 7920 Administration Guide for Cisco CallManager Release 3.3 or Later
OL-3930-02
Chapter 1 An Overview of the Cisco Wireless IP Phone 7920
Networking Protocols Used with Cisco Wireless IP Phones
Related Topics
• Understanding the Phone Startup Process, page 2-9
• Interactions with Components in the VoIP Network, page 2-1
• Modifying DHCP Settings, page 5-7
Internet Protocol (IP) IP is a 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, subnets, and gateways
identifications are automatically
assigned if you are using the
Cisco IP Phone with Dynamic Host
Configuration Protocol (DHCP). If
you are not using DHCP, you must
manually assign these properties to
each phone locally.
Real-Time Transport
(RTP)
RTP is a standard for transporting
real-time data, such as interactive
voice and video, over data networks.
Cisco IP Phones use the RTP
protocol to send and receive
real-time voice traffic from other
phones and gateways.
Transmission Control
Protocol (TCP)
TCP is a a connection-oriented
transport protocol.
Cisco IP Phones use TCP to connect
to Cisco CallManager and to access
XML services.
Trivial File Transfer
Protocol (TFTP)
TFTP allows you to transfer files
over the network.
On the Cisco IP Phone, TFTP
enables you to obtain a configuration
file specific to the phone type.
TFTP requires a TFTP server in your
network, which can be automatically
identified from the DHCP server. If
more than one TFTP server is
running in your network, you must
manually assign a TFTP server to
each phone locally.
User Datagram Protocol
(UDP)
UDP is a connectionless messaging
protocol for delivery of data packets.
Cisco IP Phones receive and process
UDP messages.
Table 1-1 Supported Networking Protocols on the Cisco Wireless IP Phone (continued)
Networking Protocol Purpose Usage Notes