Cisco 8811

Usage notesPurposeNetwork protocol
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.
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.
Session Initiation Protocol (SIP)
Cisco IP Phones use TCP to
connect to Cisco Unified
Communications Manager and to
access XML services.
TCP is a connection-oriented transport protocol.Transmission Control Protocol
(TCP)
Upon security implementation,
Cisco IP Phones use the TLS
protocol when securely registering
with Cisco Unified
Communications Manager.
TLS is a standard protocol for securing and authenticating
communications.
Transport Layer Security (TLS)
TFTP requires a TFTP server in
your network that the DHCP server
can automatically identify. If you
want a phone to use a TFTP server
other than the one that the DHCP
server specifies, you must
manually assign the IP address of
the TFTP server by using the
Network Configuration menu on
the phone.
For more information, see the
documentation for your particular
Cisco Unified Communications
Manager release.
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.
Trivial File Transfer Protocol
(TFTP)
UDP is used only for RTP streams.
SIP signaling on the phones do not
support UDP.
UDP is a connectionless messaging protocol for delivery of
data packets.
User Datagram Protocol (UDP)
Related Topics
802.1X Authentication, on page 108
Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager
16
Network Protocols