Cisco 7970G Administration Manual page 41

Chapter 1 An Overview of the Cisco Unified IP Phone
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Real-Time Control
Protocol (RTCP)
Skinny Client Control
Protocol (SCCP)
Session Initiation
Protocol (SIP)
Session Description
Protocol (SDP)
Transmission Control
Protocol (TCP)
Transport Layer
Security (TLS)
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
Purpose
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.
SIP is an emerging standard for
setting up telephone calls,
multimedia conferencing, and other
types of communications on the
Internet.
Session Description Protocol (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.
TLS is a standard protocol for
securing and authenticating
communications.
What Networking Protocols Are Used?
Usage Notes
RTCP is disabled by default, but you
can enable it on a per phone basis
using Cisco Unified CallManager.
For more information, see the
"Network Configuration" section on
page 4-35.
You can configure the Cisco
Unified IP Phone to use either SCCP
or Session Initiation Protocol (SIP).
You can configure the Cisco
Unified IP Phone to use either SCCP
or SIP.
SDP capabilities, such as codec
types, DTMF detection and comfort
noise are normally configured on a
global basis by Cisco Unified
CallManager or Media Gateway in
operation. Some SIP endpoints may
allow these parameters to be
configured on the end point itself.
This may vary from vendor to
vendor.
Cisco Unified IP Phones use TCP to
connect to Cisco
Unified CallManager and to access
XML services.
When security is implemented, Cisco
Unified IP Phones use the TLS
protocol when securely registering
with Cisco Unified CallManager.
1-7