Cisco 7912G - IP Phone VoIP Administration Manual page 32

What Networking Protocols Are Used?
Table 1-1 Supported Networking Protocols on the Cisco IP Phone (continued)
Networking Protocol
Internet Protocol (IP)
Real-Time Transport
(RTP)
Transmission Control
Protocol (TCP)
Trivial File Transfer
Protocol (TFTP)
User Datagram Protocol
(UDP)
Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G
1-8
Purpose
IP is a messaging protocol that addresses
and sends packets across the network.
RTP is a standard for transporting
real-time data, such as interactive voice
and video, over data networks.
TCP is a a connection-oriented transport
protocol.
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.
UDP is a connectionless messaging
protocol for delivery of data packets.
Related Topics
Modifying DHCP Settings, page 4-9
•
Configuring IP Settings, page 4-15
•
Chapter 1 An Overview of the Cisco IP Phone
Usage Notes
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.
Cisco IP Phones use the RTP
protocol to send and receive
real-time voice traffic from other
phones and gateways.
Cisco IP Phones use TCP to
connect to Cisco CallManager
and to access XML services.
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.
Cisco IP Phones receive and
process UDP messages.
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