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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 7.1
OL-18913-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Features are Supported on the Cisco Unified IP Phones 7962G, 7942G, 7961G, 7961G-GE, 7941G, and 7941G-GE?
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. 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.
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 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.
For more information on deploying IPv6 in your Cisco Unified Communications network, refer to the
“Internet Protocol Version 6 (IPv6)” chapter in Cisco Unified Communications Manager Features and
Services Guide and Deploying IPv6 in Unified Communications Networks with Cisco Unified
Communications Manager 7.1.
Related Topics
• Understanding Interactions with Other Cisco Unified IP Telephony Products, page 2-1
• Understanding the Phone Startup Process, page 2-7
• Network Configuration Menu, page 4-5
What Features are Supported on the Cisco Unified IP Phones
7962G, 7942G, 7961G, 7961G-GE, 7941G, and 7941G-GE?
Cisco Unified IP Phone functions much like a digital business phone, allowing you to place and receive
phone calls. In addition to traditional telephony features, the Cisco Unified IP Phone includes features
that enable you to administer and monitor the phone as a network device.
This section includes the following topics:
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