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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
Chapter1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
Real-Time Control
Protocol (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
using Cisco UnifiedCallManager.
For more information, see the
“Network Configuration” section on
page 4-35.
Skinny Client Control
Protocol (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.
You can configure the Cisco
Unified IP Phone to use either SCCP
or Session Initiation Protocol (SIP).
Session Initiation
Protocol (SIP)
SIP is an emerging standard for
setting up telephone calls,
multimedia conferencing, and other
types of communications on the
Internet.
You can configure the Cisco
Unified IP Phone to use either SCCP
or SIP.
Session Description
Protocol (SDP)
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.
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.
Transmission Control
Protocol (TCP)
TCP is a connection-oriented
transport protocol.
Cisco Unified IP Phones use TCP to
connect to Cisco
Unified CallManager and to access
XML services.
Transpor t Layer
Security (TLS)
TLS is a standard protocol for
securing and authenticating
communications.
When security is implemented, Cisco
UnifiedIP Phones use the TLS
protocol when securely registering
with Cisco UnifiedCallManager.
Table1-1 Supported Networking Protocols on the Cisco UnifiedIP Phone (continued)
Networking Protocol Purpose Usage Notes