1-5
Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
OL-14029-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
Internet Protocol (IP)
IP is a messaging protocol that
addresses and sends packets across
the network.
To communicate using IP, network
devices must have an assigned IP
address, subnet, and gateway.
IP addresses, subnets, and gateways
identifications are automatically
assigned if you are using the
Cisco Unified IP Phone with
Dynamic Host Configuration
Protocol (DHCP). If you are not
using DHCP, you must manually
assign these properties to each phone
locally.
Network Time Protocol
(NTP)
NTP is a protocol that is used to
synchronize timekeeping among a set
of distributed time servers and
clients.
When you configure Network Time
Protocol (NTP) on Cisco Unified
Communications Manager
Administration, the Cisco Unified IP
phones will get the date and time
from an NTP server.
Real-Time Transport
(RTP)
RTP is a standard protocol for
transporting real-time data, such as
interactive voice and video, over data
networks.
Cisco Unified IP Phones use the RTP
protocol to send and receive
real-time voice traffic from other
phones and gateways.
Session Description
Protocol (SDP)
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 the Cisco Unified
Communications Manager or the
Media Gateway in operation. Some
SIP endpoints may allow these
parameters to be configured on the
endpoint itself.
Table 1-1
Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Purpose
Usage Notes
Summary of Contents for 3911
Page 4: ......
