Cisco Ip Phone 8800 Series Multiplatform Phones Administration Guide - Cisco 8851 Administration Manual

Network protocol
Session Description Protocol
(SDP)
Session Description Protocol
(SDP)
Session Initiation Protocol (SIP)
Transmission Control Protocol
(TCP)
Transport Layer Security (TLS)
Trivial File Transfer Protocol
(TFTP)
Purpose
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 all endpoints in the conference support.
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 all endpoints in the conference support.
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.
TLS is a standard protocol for securing and authenticating
communications.
TFTP allows you to transfer files over the network.
On the Cisco IP Phone, TFTP enables you to obtain a
configuration file specific to the phone type.

Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide

Network Protocols
Usage notes
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 configuration of these
parameters on the endpoint itself.
SDP capabilities, such as codec
types, DTMF detection, and
comfort noise, are normally
configured on a global basis by
Third-Party Call Control System
or Media Gateway in operation.
Some SIP endpoints may allow
configuration of these parameters
on the endpoint itself.
Like other VoIP protocols, SIP
addresses the functions of signaling
and session management within a
packet telephony network.
Signaling allows transportation of
call information across network
boundaries. Session management
provides the ability to control the
attributes of an end-to-end call.
Cisco IP Phones support the SIP
protocol when the phones are
operating in IPv6-only, IPv4-only,
or in both IPv4 and IPv6.
Cisco IP Phones use TCP to
connect to Third-Party Call Control
system and to access XML
services.
Upon security implementation,
Cisco IP Phones use the TLS
protocol when securely registering
with Third-Party Call Control
system.
TFTP requires a TFTP server in
your network that the DHCP server
can automatically identify.
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