Specifications

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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5
OL-23092-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols are Used?
IPv6 Support on Cisco Unified IP Phones
The Cisco Unified IP Phone uses the internet protocol to provide voice communication over the network.
Previous to Cisco Unified Communications Manager release 8.0, only the internet protocol version 4
(IPv4) was supported. Because it uses a 32-bit address, IPv4 cannot meet the increased demands for
unique IP addresses for all devices that can connect to the internet. Internet Protocol version 6 (IPv6) is
an updated version of the current Internet Protocol, IPv4. IPv6 uses a 128-bit address and provides
end-to-end security capabilities, enhanced Quality of Service (QoS), and increased number of available
IP addresses.
The Cisco Unified IP Phone supports IPv4 only addressing mode, IPv6 only addressing mode, as well
as an IPv4/IPv6 dual stack addressing mode. In IPv4, you can enter each octet of the IP address on the
phone in dotted decimal notation; for example, 192.240.22.5. In IPv6, you can enter each octet of the IP
address in hexadecimal notation with each octet separated by a colon; for example,
2005:db8:0:1:ef8:9876:ba72:dc9a. The phone truncates and removes leading zeros when it displays the
IPv6 address.
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 Cisco Unified
Communications Manager or Media Gateway
in operation. Some SIP endpoints may allow
these parameters to be configured on the
endpoint itself.
Transmission Control
Protocol (TCP)
TCP is a connection-oriented transport
protocol.
Cisco Unified IP Phones use TCP to connect
to Cisco Unified Communications Manager
and to access XML services.
Transport Layer Security
(TLS)
TLS is a standard protocol for securing and
authenticating communications.
When security is implemented, Cisco
Unified IP Phones use the TLS protocol when
securely registering with Cisco
Unified Communications Manager.
For more information, refer to the
Cisco Unified Communications Manager
Security Guide.
Trivial File Transfer Protocol
(TFTP)
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.
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.
For more information, refer to Cisco TFTP in
the Cisco Unified Communications Manager
System Guide.
User Datagram Protocol
(UDP)
UDP is a connectionless messaging protocol
for delivery of data packets.
Cisco Unified IP Phones transmit and receive
RTP streams, which utilize UDP.
Table 1-2 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol Purpose Usage Notes