Cisco Systems OL-11953-01 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 IP Phones depend upon and interact with
several other key Cisco Unified IP Telephony components, including
Cisco Unified Communications Manager.

This chapter focuses on the interactions between the Cisco Unified IP Phone
7961G/7961G-GE and 7941G/7941G-GE 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:

http://www.cisco.com/en/US/partner/products/sw/voicesw/index.html

This chapter provides an overview of the interaction between the
Cisco Unified IP Phone and other key components of the Voice over IP (VoIP)
network. It includes the following topics:

• Understanding Interactions with Other Cisco Unified IP Telephony Products,

page 2-2

• Providing Power to the Cisco Unified IP Phone, page 2-4

• Understanding Phone Configuration Files, page 2-8

• Understanding the Phone Startup Process, page 2-10

• Adding Phones to the Cisco Unified Communications Manager Database,

page 2-13

• Using Cisco Unified IP Phones with Different Protocols, page 2-18

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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Understanding Interactions with Other Cisco Unified IP Telephony Products

• Determining the MAC Address for a Cisco Unified IP Phone, page 2-20

Understanding Interactions with Other Cisco
Unified IP Telephony 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 the following 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

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 such features 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 Telephony Products

For information about configuring Cisco Unified Communications Manager to
work with the IP devices 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 1-13.

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 Cisco Unified IP Phone, page 5-2

Understanding How the Cisco Unified IP Phone Interacts with the VLAN

The Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE have 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 addresses might not be available to assign the phone to the same
subnet as other devices connected to the same port.

• Data traffic present on the VLAN supporting phones might 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 Cisco Unified IP 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

6000 series, for example)

• Data traffic to and from the PC connected to the switch through the access

port of the IP phone (native VLAN)

Isolating the phones on a separate, auxiliary VLAN increases 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_categ
ory_home.html

Related Topics

• Understanding the Phone Startup Process, page 2-10

• Network Configuration Menu, page 4-7

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Providing Power to the Cisco Unified IP Phone

The Cisco Unified IP Phone 7961G, 7961G-GE and 7941G, 7941G-GE 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.

Note When you install a phone that is powered with external power, connect the power

supply to the phone and to a power outlet before you connect the Ethernet cable
to the phone. When you remove a phone that is powered with external power,
disconnect the Ethernet cable from the phone before you disconnect the power
supply.

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Providing Power to the Cisco Unified IP Phone

The following sections provide more information about powering a phone:

• Power Guidelines, page 2-5

• Power Outage, page 2-7

• Obtaining Additional Information about Power, page 2-7

Power Guidelines

Table 2-1 provides guidelines for powering the Cisco Unified IP Phone 7961G

and 7941G.

Table 2-2 provides guidelines for powering the Cisco Unified IP Phone

7961G-GE and 7941G-GE.

Table 2-1 Powering Guidelines—Cisco Unified IP Phone 7961G and 7941G

Power Type Guidelines

External power—
Provided through the
CP-PWR-CUBE-3
external power supply.

External power—
Provided through the
Cisco Unified IP Phone
Power Injector.

• The Cisco Unified IP Phone 7961G and 7941G use the

CP-PWR-CUBE-3 power supply.

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 IP
Phone.

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Providing Power to the Cisco Unified IP Phone

Table 2-1 Powering Guidelines—Cisco Unified IP Phone 7961G and 7941G (continued)

Power Type Guidelines

PoE power—Provided by
a switch through the
Ethernet cable attached
to the phone.

External power—
Provided through inline
power patch panel
WS-PWR-PANEL

• The Cisco Unified IP Phone 7961G and 7941G support Cisco inline

PoE.

• The Cisco Unified IP Phone 7961G and 7941G support IEEE 802.3af

power on signal pairs and spare pairs.

• To ensure uninterruptible operation of the phone, make sure that the

switch has a backup power supply.

• 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.

The inline power patch panel WS-PWR-PANEL is compatible with the
Cisco Unified IP Phones 7961G and 7941G.

Table 2-2 Powering Guidelines—Cisco Unified IP Phone 7961G-GE and 7941G-GE

Power Type Guidelines

External power—
Provided through the

• The Cisco Unified IP Phone 7961G-GE and 7941G-GE use the

CP-PWR-CUBE-3 external power supply only.
CP-PWR-CUBE-3
external power supply.

External power—
Provided through the
Cisco Unified IP Phone
Power Injector.

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 IP
Phone.

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