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Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
1-8
Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01
Session Description
Protocol (SDP)
SDP is the portion of the SIP protocol
that determines which parameters are
available during a connection
between two endpoints. Conferences
are established using only the SDP
capabilities that are supported by all
endpoints in the conference.
SDP capabilities, such as codec
types, DTMF detection, and comfort
noise, are normally configured on a
global basis by Cisco Unified
Communications Manager or Media
Gateway in operation. Some SIP
endpoints may allow these
parameters to be configured on the
endpoint itself.
Transmission Control
Protocol (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.
Transport Layer
Security (TLS)
TLS is a standard protocol for
securing and authenticating
communications.
When security is implemented, Cisco
Unified IP Phones use the TLS
protocol when securely registering
with Cisco Unified Communications
Manager.
Trivial File Transfer
Protocol (TFTP)
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.
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 TFTP server from the
Network Configuration menu on the
phone.
User Datagram Protocol
(UDP)
UDP is a connectionless messaging
protocol for delivery of data packets.
Cisco Unified IP Phones transmit and
receive RTP streams, which utilize
UDP.
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol Purpose Usage Notes
26


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