Cisco 6921 Administration Manual page 25

Chapter 1 An Overview of the Cisco Unified IP Phone
Table 1-4 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Real-Time Transport
Protocol (RTP)
Real-Time Control
Protocol (RTCP)
Skinny Client Control
Protocol (SCCP)
Transmission Control
Protocol (TCP)
Transport Layer Security
(TLS)
Trivial File Transfer
Protocol (TFTP)
User Datagram Protocol
(UDP)
Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP)
OL-20851-01
Purpose
LLDP-MED is an extension of the LLDP
standard developed for voice products.
RTP is a standard protocol for transporting
real-time data, such as interactive voice
and video, over data networks.
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.
TCP is a connection-oriented transport
protocol.
TLS is a standard protocol for securing
and authenticating communications.
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.
UDP is a connectionless messaging
protocol for delivery of data packets.
What Networking Protocols are Used?
Usage Notes
The Cisco Unified IP Phone supports LLDP-MED
on the SW port to communicate information such as:
Voice VLAN configuration
•
Device discovery
•
Power management
•
Inventory management
•
For more information about LLDP-MED support,
see the LLDP-MED and Cisco Discovery Protocol
white paper:
http://www.cisco.com/en/US/tech/tk652/tk701/tech
nologies_white_paper0900aecd804cd46d.shtml
Cisco Unified IP Phones use the RTP protocol to
send and receive real-time voice traffic from other
phones and gateways.
RTCP is disabled by default, but you can enable it
on a per phone basis by using Cisco Unified CM.
Cisco Unified IP Phone 6921, 6941, and 6961 use
SCCP, version 15 for call control.
Cisco Unified IP Phones use TCP to connect to
Cisco Unified CM and to access XML services.
When security is implemented, Cisco
Unified IP Phones use the TLS protocol when
securely registering with Cisco Unified CM.
For more information, refer to the Cisco Unified
Communications Manager Security Guide.
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 the IP address of
the TFTP server by using the Network Setup menu
on the phone.
For more information, go to the
in the Cisco Unified Communications Manager
System Guide.
Cisco Unified IP Phones transmit and receive RTP
streams, which utilize UDP.
Cisco TFTP chapter
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