Usage NotesPurposeNetwork Protocol
When security is implemented, Cisco
Unified IP Phones use the TLS protocol
when securely registering with Cisco
Unified Communications Manager.
For more information, see Cisco Unified
Communications Manager Security
Guide.
TLS is a standard protocol for securing
and authenticating communications.
Transport Layer Security
(TLS)
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 the IP
address of the TFTP server by using the
Network Configuration menu on the
phone.
For more information, see “Cisco TFTP”
chapter in the Cisco Unified
Communications Manager System Guide.
TFTP allows you to transfer files over
the network.
On the Cisco Unified IP Phones, TFTP
enables you to obtain a configuration
file specific to the phone type.
Trivial File Transfer
Protocol (TFTP)
Cisco Unified IP Phones transmit and
receive RTP streams, which utilize UDP.
UDP is a connectionless messaging
protocol for delivery of data packets.
User Datagram Protocol
(UDP)
Related Topics
802.1X Authentication, on page 21
Network Configuration Menu, on page 101
IPv6 Support on Cisco Unified IP Phones
The Cisco Unified IP Phones use the Internet Protocol to provide voice communication over the network.
Because Internet Protocol version 4 (IPv4) uses a 32-bit address, it cannot meet the increased demands for
unique IP addresses for all devices that connect to the internet. Therefore, Internet Protocol version 6 (IPv6)
is an updated version of the current Internet Protocol. 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 IPv6 addresses transparently, so users can handle all calls on
the phone to which they are accustomed. Cisco Unified IP Phones with the Skinny Call Control Protocol
(SCCP) support IPv6. Cisco Unified IP Phones with SIP do not support IPv6.
Cisco Unified IP Phone 7941G, 7941G-GE, 7942G, 7961G, 7961G-GE, and 7962G Administration Guide for Cisco
Unified Communications Manager 9.0 (SCCP and SIP)
10
Cisco Unified IP Phone
IPv6 Support on Cisco Unified IP Phones
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