Cisco CP-3911 - Unified SIP Phone 3911 VoIP Administration Manual page 22

What Networking Protocols Are Used?
Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Session Initiation
Protocol (SIP)
Transmission Control
Protocol (TCP)
Trivial File Transfer
Protocol (TFTP)
User Datagram Protocol
(UDP)
Cisco Unified SIP Phone 3911 Administration Guide for Cisco Unified Communications Manager
1-6
Purpose
SIP is the Internet Engineering task
Force (IETF) standard for
multimedia conferencing over IP. SIP
is an ASCII-based, application-layer
control protocol (defined in RFC
3261) that can be used to establish,
maintain, and terminate calls
between two or more endpoints.
TCP is a connection-oriented
transport protocol.
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.
Related Topics
Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified
•
Communications Manager, page 2-2
Understanding the Phone Startup Process, page 2-7
•
Configuration Menus on the Cisco Unified IP Phone, page 4-3
•
Chapter 1 An Overview of the Cisco Unified IP Phone
Usage Notes
Like other VoIP protocols, SIP is
designed to address the functions of
signaling and session management
within a packet telephony network.
Signaling allows call information to
be carried across network
boundaries. Session management
provides the ability to control the
attributes of an end-to-end call.
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 using the Network
Configuration menu on the phone.
Cisco Unified IP Phones transmit
and receive RTP streams, which
utilize UDP.
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