Cisco 7970G - IP Phone VoIP Administration Manual page 26

What Networking Protocols Are Used?
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Session Initiation
Protocol (SIP)
Skinny Client Control
Protocol (SCCP)
Session Description
Protocol (SDP)
Transmission Control
Protocol (TCP)
Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 6.1
1-8
Purpose
SIP is the Internet Engineering Task
Force (IETF) standard for
multimedia conferencing over IP. SIP
is an ASCII-based application-layer
control protocol (defined in
RFC 3261) that can be used to
establish, maintain, and terminate
calls between two or more endpoints.
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.
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.
TCP is a connection-oriented
transport protocol.
Chapter 1 An Overview of the Cisco Unified IP Phone
Usage Notes
Like other VoIP protocols, SIP is
designed to address the functions of
signaling and session management
within a packet telephony network.
Signaling allows call information to
be carried across network
boundaries. Session management
provides the ability to control the
attributes of an end-to-end call.
You can configure the Cisco
Unified IP Phone to use either SIP or
Skinny Client Control Protocol
(SCCP).
Cisco Unified IP Phones use SCCP
for call control. You can configure
the Cisco Unified IP Phone to use
either SCCP or Session Initiation
Protocol (SIP).
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.
Cisco Unified IP Phones use TCP to
connect to Cisco
Unified Communications Manager
and to access XML services.
OL-14626-01