Usage notes
Purpose
Network protocol
DHCP is enabled by default. If
disabled, you must manually
configure the IP address, subnet
mask, gateway, and a TFTP server
on each phone locally.
Cisco recommends that you use
DHCP custom option 150. With
this method, you configure the
TFTP server IP address as the
option value. For additional
supported DHCP configurations,
see the
“
Dynamic Host
Configuration Protocol
”
chapter
and the
“
Cisco TFTP
”
chapter in
the
Cisco Unified Communications
Manager System Guide
.
If you cannot use option
150, you may try using
DHCP option 66.
Note
DHCP dynamically allocates and assigns an IP address to
network devices.
DHCP enables you to connect an IP phone into the network
and the phone to become operational without the need to
manually assign an IP address or to configure additional
network parameters.
Dynamic Host Configuration
Protocol (DHCP)
Cisco Unified IP Phones use HTTP
for XML services and for
troubleshooting purposes.
HTTP is the standard way of transferring information and
moving documents across the Internet and the web.
Hypertext Transfer Protocol
(HTTP)
Web applications with both HTTP
and HTTPS support have two
URLs configured. Cisco Unified
IP Phones that support HTTPS
choose the HTTPS URL.
Hypertext Transfer Protocol Secure (HTTPS) is a combination
of the Hypertext Transfer Protocol with the SSL/TLS protocol
to provide encryption and secure identification of servers.
Hypertext Transfer Protocol
Secure (HTTPS)
The Cisco Unified IP Phone
implements the IEEE 802.1X
standard by providing support for
the following authentication
methods: EAP-FAST, EAP-TLS,
and EAP-MD5.
When 802.1X authentication is
enabled on the phone, you should
disable the PC port and voice
VLAN. See
Authentication, on page 33
for
additional information.
The IEEE 802.1X standard defines a client-server-based
access control and authentication protocol that restricts
unauthorized clients from connecting to a LAN through
publicly accessible ports.
Until the client is authenticated, 802.1X access control allows
only Extensible Authentication Protocol over LAN (EAPOL)
traffic through the port to which the client is connected. After
authentication is successful, normal traffic can pass through
the port.
IEEE 802.1X
(Cisco Unified IP Phone 9971
only) The 802.11 interface is a
deployment option for cases when
Ethernet cabling is unavailable or
undesirable.
The IEEE 802.11 standard specifies how devices
communication over a wireless local area network (WLAN).
802.11a operates at the 5 GHz band and 802.11b and 802.11g
operate at the 2.4 GHz band
IEEE 802.11a/b/g
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
22
Cisco Unified IP Phone
Network protocols
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