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Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 7.1 (SCCP)
OL-19025-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols are Used?
Related Topics
• 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
Internet Protocol (IP) IP is a messaging protocol that addresses
and send
s packets across the network.
To communicate using IP, network devices must
have an assigned IP address, subnet, and gateway.
IP addresses, subnets, and gat
eways identifications
are automatically assigned if you are using the
Cisco Unified IP Phone with Dynamic Host
Co
nfiguration Protocol (DHCP). If you are not
using DHCP, you must manually assign these
properties to each phone locally.
Real-Time Transport
Pro
tocol (RTP)
RTP is a standard protocol 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.
Real-Time Control
Pro
tocol (RTCP)
RTCP works in conjunction with RTP to
provide QoS data (such as jitter, latency,
and round trip delay) on RTP streams.
RTCP is disabled by default, but you can enable it
on a per phone basis by using Cisco Unified
Commu
nications Manager.
Skinny Client Control
Pro
tocol (SCCP)
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.
Cisco Unified IP Phone 6921, 6941, and 6961 use
SCCP
, version 15 for call control.
Transmission Control
Pro
tocol (TCP)
TCP is a connection-oriented transport
protocol.
Cisco Unified IP Phones use TCP to connect to
Cisco Unified Communications Manager and to
access XML services.
Trivial File Transfer
Protocol (TFTP)
TFTP allows you to transfer files over the
netw
ork.
On the Cisco Unified IP Phone, TFTP
enables yo
u to obtain a configuration file
specific to the phone type.
TFTP requires a TFTP server in your network,
which can b
e 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 Ci
sco TFTP chapter
in the Cisco U
nified Communications Manager
System Guide.
User Datagram Protocol
(UDP)
UDP is a connectionless messaging
pro
tocol for delivery of data packets.
Cisco Unified IP Phones transmit and receive RTP
streams, which utilize UDP.
Table 1-4 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol Purpose Usage Notes