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Chapter 1
An Overview of the Cisco Unified IP Phones
Table 1-2
Supported Networking Protocols on the Cisco Unified IP Phones (continued)
Networking Protocol
Internet Protocol (IP)
Link Layer Discovery
Protocol (LLDP)
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Real-Time Transport
Protocol (RTP)
Real-Time Control
Protocol (RTCP)
Session Description
Protocol (SDP)
OL-23091-01
Purpose
IP is a messaging protocol that addresses
and sends packets across the network.
LLDP is a standardized network discovery
protocol (similar to CDP) that some Cisco
and third-party devices support.
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 Quality of Service (QoS) data
(such as jitter, latency, and round trip
delay) on RTP streams.
SDP is the portion of the SIP protocol that
determines which parameters are available
during a connection between two
endpoints. Conferences are established by
using only the SDP capabilities that are
supported by all endpoints in the
conference.
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
What Networking Protocols are Used?
Usage Notes
To communicate using IP, network devices must
have an assigned IP address, subnet, and gateway.
IP addresses, subnets, and gateway identifications
are automatically assigned if you are using the
Cisco Unified IP Phones with Dynamic Host
Configuration Protocol (DHCP). If you are not
using DHCP, you must manually assign these
properties to each phone locally. The Cisco Unified
IP Phones support concurrent IPv4 and IPv6
addresses. Configure the IP addressing mode (IPv4
only, IPv6 only, and both IPv4 and IPv6) in Cisco
Unified Communications Manager Administration.
For more information, see
6 (IPv6)
in the Cisco Unified Communications
Manager Features and Services Guide.
The Cisco Unified IP Phones support LLDP on the
PC port.
The Cisco Unified IP Phones support 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
Communications Manager. For more information,
see
Network Configuration Menu, page
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.
Internet Protocol Version
4-34.
1-7
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Troubleshooting
