Cisco Systems OL-14587-01 User Manual
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Preparing to Install the Cisco
Unified IP Phone on Your Network
Cisco Unified IP Phones enable you to communicate using voice over a data
network. To provide this capability, the phones depend upon and interact with
several other key Cisco IP Telephony and network components, including
Cisco Unified Communications Manager, DNS and DHCP servers, TFTP servers,
media resources, Cisco prestandard PoE, and so on.
This chapter focuses on the interactions between the Cisco Unified IP Phone
7931G and Cisco Unified Communications Manager, DNS and DHCP servers,
TFTP servers, and switches. It also describes options for powering phones.
For related information about voice and IP communications, refer to this URL
(you must be a registered Cisco.com user):
http://www.cisco.com/en/US/partner/products/sw/voicesw/index.html
This chapter includes these topics:
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• Understanding Interactions with Other Cisco Unified IP Communications
Products, page 2-2
• Providing Power to the Phone, page 2-4
• Understanding Phone Configuration Files, page 2-6
• Understanding the Phone Startup Process, page 2-8
• Adding Phones to the Cisco Unified Communications Manager Database,
page 2-11
• Determining the MAC Address of a Cisco Unified IP Phone, page 2-15
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Interactions with Other Cisco Unified IP Communications Products
Understanding Interactions with Other Cisco
Unified IP Communications Products
To function in the IP telephony network, the Cisco Unified IP Phone must be
connected to a networking device, such as a Cisco Catalyst switch. You must also
register the Cisco Unified IP Phone with a Cisco Unified Communications
Manager system before sending and receiving calls.
This section includes these topics:
• Understanding How the Cisco Unified IP Phone Interacts with Cisco
Unified Communications Manager, page 2-2
• Understanding How the Cisco Unified IP Phone Interacts with the VLAN,
page 2-3
Understanding How the Cisco Unified IP Phone Interacts with Cisco Unified Communications Manager
2-2
Cisco Unified Communications Manager is an open and industry-standard call
processing system. Cisco Unified Communications Manager software sets up and
tears down calls between phones, integrating traditional PBX functionality with
the corporate IP network. Cisco Unified Communications Manager manages the
components of the IP telephony system—the phones, the access gateways, and the
resources necessary for features such as call conferencing and route planning.
Cisco Unified Communications Manager also provides:
• Firmware for phones
• Authentication and encryption (if configured for the telephony system)
• Configuration file and CTL file, via TFTP service
• Phone registration
• Call preservation, so that a media session continues if signaling is lost
between the primary Communications Manager and a phone
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding Interactions with Other Cisco Unified IP Communications Products
For information about configuring Cisco Unified Communications Manager to
work with the IP devices that described in this chapter, refer to Cisco
Unified Communications Manager Administration Guide, Cisco Unified
Communications Manager System Guide, and to Cisco Unified Communications
Manager Security Guide.
For an overview of security functionality for the Cisco Unified IP Phone, see the
“Understanding Security Features for Cisco Unified IP Phones” section on
page 1-14.
Note If the Cisco Unified IP Phone model that you want to configure does not appear
in the Phone Type drop-down list in Cisco Unified Communications Manager
Administration, go to the following URL and install the latest support patch for
your version of Cisco Unified Communications Manager:
http://www.cisco.com/kobayashi/sw-center/sw-voice.shtml
Related Topic
• Telephony Features Available for the Phone, page 5-2
Understanding How the Cisco Unified IP Phone Interacts with the VLAN
The Cisco Unified IP Phone 7931G has an internal Ethernet switch, enabling
forwarding of packets to the phone, and to the access port and the network port on
the back of the phone.
If a computer is connected to the access port, the computer and the phone share
the same physical link to the switch and share the same port on the switch. This
shared physical link has the following implications for the VLAN configuration
on the network:
• The current VLANs might be configured on an IP subnet basis. However,
additional IP address might not be available to assign the phone to the same
subnet as other devices connect to the same port.
• Data traffic present on the data/native VLAN may reduce the quality of
Voice-over-IP traffic.
• Network security may indicate a need to isolate the VLAN voice traffic from
the VLAN data traffic.
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Providing Power to the Phone
You can resolve these issues by isolating the voice traffic onto a separate VLAN.
The switch port that the phone is connected to would be configured to have
separate VLANs for carrying:
• Voice traffic to and from the IP phone (auxiliary VLAN, on the Cisco Catalyst
• Data traffic to and from the PC connected to the switch through the access
Isolating the phones on a separate, auxiliary VLAN improves the quality of the
voice traffic and allows a large number of phones to be added to an existing
network where there are not enough IP addresses for each phone.
For more information, refer to the documentation included with a Cisco switch.
You can also access related documentation at this URL:
http://www.cisco.com/en/US/products/hw/switches/tsd_products_support_
category_home.html
Related Topics
• Understanding the Phone Startup Process, page 2-8
• Network Configuration Menu, page 4-7
Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
6000 series, for example)
port of the IP phone (native VLAN)
Providing Power to the Phone
The Cisco Unified IP Phones 7931G can be powered with external power or with
Power over Ethernet (PoE). External power is provided through a separate power
supply. PoE is provided by a switch through the Ethernet cable attached to a
phone.
• Power Outage, page 2-5
• Power Guidelines, page 2-5
• Obtaining Additional Information about Power, page 2-6
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Power Outage
Your accessibility to emergency service through the phone is dependent on the
phone being powered. If there is an interruption in the power supply, Service and
Emergency Calling Service dialing will not function until power is restored. In the
case of a power failure or disruption, you may need to reset or reconfigure
equipment before using the Service or Emergency Calling Service dialing.
Power Guidelines
Table 2 -1 provides guidelines that apply to external power and to PoE power for
the Cisco Unified IP Phones 7931G.
Table 2-1 Guidelines for Powering the Cisco Unified IP Phones 7931G
Power Type Guidelines
External power—
Provided through a Cisco
external power supply.
External power—
Provided through the
Cisco Unified IP Phone
Power Injector.
PoE power—Provided by
a switch through the
Ethernet cable attached to
the phone.
The CP-PWR-CUBE-3 external power supply may be used with the
Cisco Unified IP Phones 7931G.
The Cisco Unified IP Phone Power Injector may be used with any
Cisco Unified IP Phone. Functioning as a midspan device, the injector
delivers inline power to the attached phone. The Cisco Unified IP Phone
Power Injector is connected between a switch port and the IP Phone, and
supports a maximum cable length of 100m between the unpowered switch
and the phone.
• The Cisco Unified IP Phones 7931G supports IEEE 802.3af Power
over Ethernet.
• To ensure uninterruptible operation of the phone, make sure that the
switch has a backup power supply.
Providing Power to the Phone
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• Make sure that the CatOS or IOS version running on your switch
supports your intended phone deployment. Refer to the documentation
for your switch for operating system version information.
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