Specifications

1-7
Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 8.0
OL-21033-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols are Used?
Related Topics
• Understanding Interactions with Other Cisco Unified Communications Products, page 2-1
• Understanding the Phone Startup Process, page 2-5
• Network Configuration Menu, page 4-5
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 7.1, only the internet protocol version 4
(IPv4) was supported. However because IPv4 uses a 32-bit address, it cannot meet the increased
demands for unique IP addresses for all devices that can connect to the internet. Therefore, Internet
Protocol version 6 (IPv6), an updated version of the current Internet Protocol, IPv4 is now supported.
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.
Cisco Unified IP Phones support both IPv4 and an IPv6 address transparently, so users can handle all
calls on the phone to which they are accustomed. Cisco Unified IP Phones support the use of IPv6 only
with Cisco Unified Communications Manager release 7.1 and only with the Skinny Call Control Protocol
(SCCP).
Cisco Unified IP Phones do not support URLs with IPv6 addresses in the URL. This affects all IP Phone
Service URLs, including services, directories, messages, help, and any restricted web services that
require the phone to use the HTTP protocol to validate the credentials with the Authentication URL. If
you configure Cisco Unified IP Phone services for Cisco Unified IP Phones, you must configure the
phone and the servers that support the phone service with IPv4 addresses.
If you configure IPv6 Only as the IP Addressing Mode for phones that are running SIP, the Cisco TFTP
service overrides the IP Addressing Mode configuration and uses IPv4 Only in the configuration file.
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 more than
one TFTP server is running in your network, you must
manually assign a TFTP server to each phone locally.
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 receive and process UDP messages.
Table 1-2 Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol Purpose Usage Notes