Cisco 6921 Administration Manual page 24

What Networking Protocols are Used?
Table 1-4 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Internet Protocol (IP)
Real-Time Transport
Protocol (RTP)
Real-Time Control
Protocol (RTCP)
Skinny Client Control
Protocol (SCCP)
Transmission Control
Protocol (TCP)
Trivial File Transfer
Protocol (TFTP)
User Datagram Protocol
(UDP)
Related Topics
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•
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Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 7.1 (SCCP)
1-10
Purpose
IP is a messaging protocol that addresses
and sends packets across the network.
RTP is a standard protocol for transporting
real-time data, such as interactive voice
and video, over data networks.
RTCP works in conjunction with RTP to
provide QoS data (such as jitter, latency,
and round trip delay) on RTP streams.
SCCP includes a messaging set that allows
communications between call control
servers and endpoint clients such as IP
Phones. SCCP is proprietary to Cisco
Systems.
TCP is a connection-oriented transport
protocol.
TFTP allows you to transfer files over the
network.
On the Cisco Unified 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.
Understanding Interactions with Other Cisco Unified IP Telephony Products, page 2-1
Understanding the Phone Startup Process, page 2-6
Network Setup Menu, page 4-4
Chapter 1 An Overview of the Cisco Unified 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 Unified 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 Unified IP Phones use the RTP protocol to
send and receive real-time voice traffic from other
phones and gateways.
RTCP is disabled by default, but you can enable it
on a per phone basis by using Cisco Unified
Communications Manager.
Cisco Unified IP Phone 6921, 6941, and 6961 use
SCCP, version 15 for call control.
Cisco Unified IP Phones use TCP to connect to
Cisco Unified Communications Manager and to
access XML services.
TFTP requires a TFTP server in your network,
which can be automatically identified from the
DHCP server. If you want a phone to use a TFTP
server other than the one specified by the DHCP
server, you must manually assign the IP address of
the TFTP server by using the Network
Configuration menu on the phone.
For more information, go to the
in the Cisco Unified Communications Manager
System Guide.
Cisco Unified IP Phones transmit and receive RTP
streams, which utilize UDP.
Cisco TFTP chapter
OL-19025-01