Understanding the SIP Protocol
Table 1-1
Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol
Trivial File Transfer
Protocol (TFTP)
User Datagram Protocol
(UDP)
Understanding the SIP Protocol
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
1-8
Purpose
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 the SIP Protocol, page 1-8
•
Understanding Interactions with Other Cisco Unified IP Communications
•
Products, page 2-2
•
Understanding the Phone Startup Process, page 2-9
Network Configuration Menu, page 4-7
•
Session Initiation Protocol (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.
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.
Chapter 1
An Overview of the Cisco Unified IP Phone
Usage Notes
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 TFTP server from the
Network Configuration menu on the
phone.
Cisco Unified IP Phones transmit and
receive RTP streams, which utilize
UDP.
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