AudioCodes C450HD User manual

User's Manual
AudioCodes High Definition IP Phones Series
C450HD IP Phone for
Microsoft®Skype™for
Business
Version 3.2.0

User's Manual Contents
3 C450HD IP Phone
Table of Contents
1Introduction ...............................................................................................................11
1.1 Highlights...................................................................................................................... 11
1.2 Unified Communications ............................................................................................... 11
1.3 Management................................................................................................................. 11
2Setting up the Phone.................................................................................................13
2.1 Unpacking..................................................................................................................... 13
2.2 Device Description ........................................................................................................ 14
2.2.1 Front View.....................................................................................................................14
2.2.2 Rear View .....................................................................................................................16
2.3 Cabling.......................................................................................................................... 17
2.4 Mounting the Phone...................................................................................................... 18
2.4.1 Desktop Mounting .........................................................................................................18
2.4.2 Mounting the Expansion Unit on a Desktop....................................................................18
2.4.2.1 Routing the Handset Cable.............................................................................18
2.4.3 Wall Mounting ...............................................................................................................19
3Getting Started...........................................................................................................21
3.1 Getting Acquainted with the Phone's Touch Screen...................................................... 21
3.2 Softkeys........................................................................................................................ 22
3.3 Navigating the Phone Menu.......................................................................................... 24
3.4 Selecting an Alphanumerical Mode............................................................................... 26
3.5 Signing In...................................................................................................................... 28
3.5.1 Signing in with PIN Code...............................................................................................28
3.5.2 Signing in with User Name and Password......................................................................29
3.5.3 Signing in with the Web Sign-in (Cloud) Option..............................................................30
3.5.4 Signing in using the Web Login Option ..........................................................................30
3.5.4.1 Users with IP Phone Manager Pro / Express Version 7.4.3000 or Earlier ........32
3.6 Signing in as a Common Area Phone (CAP) User ........................................................ 33
3.7 Signing Out ................................................................................................................... 36
3.7.1 Signing out if the 'Sign out' Softkey is Removed from the Touch Screen ........................36
3.8 Hot Desking .................................................................................................................. 40
3.9 Viewing Process Messages Displayed in the Screen .................................................... 41
4Using the Phone's Automatic Lock Feature............................................................43
4.1 Enabling the Feature..................................................................................................... 43
4.2 Unlocking a Locked Phone............................................................................................ 44
4.3 Manually Changing the Lock Code................................................................................ 44
4.4 Dialing Emergency Numbers if the Phone is Locked..................................................... 46
4.5 Using Other Functionalities if the Phone is Locked ....................................................... 46
5Customizing Your Phone..........................................................................................47
5.1 Changing the Screen Language.................................................................................... 47
5.2 Selecting Ring Tone...................................................................................................... 48
5.3 Displaying Contacts Pictures......................................................................................... 49
5.4 Enabling Call Waiting.................................................................................................... 52
5.5 Managing Simultaneous Incoming Calls........................................................................ 52

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5.5.1 Configuring Busy on Busy .............................................................................................53
5.6 Configuring Call Forwarding.......................................................................................... 54
5.7 Making Sure the NTP Server is Enabled....................................................................... 56
5.8 Configuring Screen Brightness...................................................................................... 58
5.9 Selecting an Answering Device..................................................................................... 60
5.10 Viewing your Location Information ................................................................................ 61
5.11 Uploading Logs to Microsoft Server .............................................................................. 62
5.12 Configuring an Outbound Proxy.................................................................................... 63
5.13 Adjusting Volume.......................................................................................................... 64
5.13.1 Adjusting Ring Volume ..................................................................................................64
5.13.2 Adjusting Tones Volume................................................................................................64
5.13.3 Adjusting Handset Volume ............................................................................................65
5.13.4 Adjusting Speaker Volume ............................................................................................65
5.13.5 Adjusting Headset Volume ............................................................................................66
5.14 Managing Phone Directories......................................................................................... 67
5.14.1 Accessing Directories....................................................................................................67
5.14.2 Adding a Contact to the Personal Directory....................................................................68
5.14.3 Editing Contact Information in the Personal Directory.....................................................70
5.14.4 Deleting a Contact from the Personal Directory..............................................................71
5.14.5 Adding a Person to Favorites after a Call with them is Logged .......................................72
5.14.6 Removing a Person from Favorites................................................................................73
5.14.7 Adding a Distribution Group to Favorites........................................................................74
5.14.8 Searching for a Contact in a Directory ...........................................................................75
5.15 Searching for a Contact in the Corporate Directory using T9......................................... 76
5.15.1 Searching for a Contact Using A/a/1 Instead of T9.........................................................77
5.16 Configuring a Function Key as a Speed Dial ................................................................. 78
5.16.1 Configuring Pause Dialing for a Speed Dial to an Ext. behind an IVR.............................79
5.16.2 Deleting a Speed Dial....................................................................................................80
5.17 Configuring a Function Key as Speed Dial in the Expansion Module Screen ................ 81
5.18 Configuring a Function Key as a Key Event .................................................................. 83
5.19 Configuring a Function Key for Direct Voice Dialing ...................................................... 85
5.20 Configuring a Function Key for Paging.......................................................................... 86
5.21 Configuring a Function Key for Making a Discreet Call.................................................. 88
5.22 Deleting a Function Key................................................................................................ 89
5.23 Changing your Presence Status.................................................................................... 90
5.24 Viewing Microsoft Exchange Calendar in the Phone's Touch Screen............................ 92
5.25 Receiving Meeting Reminders ...................................................................................... 93
5.25.1 Displaying Calendar Meetings without Identifying Details...............................................94
5.26 Determining Meeting Attendees' Presence Status......................................................... 95
6Performing Basic Operations ...................................................................................97
6.1 Using Audio Devices..................................................................................................... 97
6.2 Checking Voice Quality ................................................................................................. 97
6.3 Making Calls ................................................................................................................. 98
6.3.1 Dialing...........................................................................................................................99
6.3.2 Redialing.....................................................................................................................100
6.3.3 Dialing a Missed Call ...................................................................................................101
6.4 Answering Calls .......................................................................................................... 102
6.5 Rejecting Incoming Calls............................................................................................. 103

User's Manual Contents
5 C450HD IP Phone
6.6 Silencing Incoming Calls ............................................................................................. 103
6.7 Ending an Established Call ......................................................................................... 104
6.8 Viewing Missed, Received and Dialed Calls................................................................ 105
6.9 Reporting a Malicious Call........................................................................................... 107
7Performing Advanced Operations .........................................................................109
7.1 Answering Waiting Calls ............................................................................................. 109
7.2 Placing Calls On Hold ................................................................................................. 111
7.3 Handling Multiple Incoming Calls ................................................................................ 111
7.4 Using a Speed Dial to Call a Contact .......................................................................... 112
7.5 Accessing Speed Dials when in a Call ........................................................................ 113
7.6 Making a Call in Discreet Mode................................................................................... 114
7.7 Transferring Calls........................................................................................................ 115
7.7.1 Performing a Blind Transfer.........................................................................................115
7.7.2 Performing a Consultative Transfer..............................................................................116
7.7.3 Performing a Semi-Consultative Transfer ....................................................................117
7.7.4 Merging Calls ..............................................................................................................118
7.8 Parking a Call.............................................................................................................. 119
7.9 Configuring Group Call Pickup (GCP)......................................................................... 119
7.10 Initiating a Multi-Party Skype for Business Remote Conference.................................. 120
7.11 Muting Calls ................................................................................................................ 125
7.12 Paging ........................................................................................................................ 126
7.12.1 Barge-in ......................................................................................................................126
7.12.2 Performing a Paging Call.............................................................................................126
7.12.3 Receiving an Incoming Paging Call..............................................................................127
7.13 Setting up Better Together over Ethernet.................................................................... 129
7.13.1 Installing the BToE PC/Laptop Application...................................................................129
7.13.2 Making Sure BToE is Correctly Installed ......................................................................137
7.13.3 Configuring the BToE TCP Port...................................................................................137
7.13.4 Enabling BToE for Online Users ..................................................................................138
7.13.5 Automatically Pairing the BToE PC/Laptop Application with the Phone ........................138
7.13.6 Manually Pairing the BToE PC/Laptop Application with the Phone ...............................139
7.13.6.1 Manually Generating a Pair Code .................................................................139
7.13.6.2 Manually Connecting the Phone with the BToE PC/Laptop Application .........140
7.13.6.3 Connecting the Skype for Business Client with the Phone.............................143
7.13.7 Making Sure the Phone/ Skype for Business Client are Paired.....................................143
7.13.7.1 Making Sure Skype for Business Client is Paired ..........................................143
7.13.7.2 Making Sure the Phone is Paired..................................................................144
7.14 Using BToE Functions ................................................................................................ 145
7.14.1 Signing in to the Phone from the Skype for Business Client .........................................145
7.14.2 Making a Call (Click-to-Dial) ........................................................................................146
7.14.3 Answering a Call .........................................................................................................146
7.14.4 Establishing a Unified Communications Call Conference .............................................147
7.14.5 Transferring a Call.......................................................................................................149
7.14.6 Switching the Primary Audio Device ............................................................................149
7.14.7 Routing Voice from a Video Call to the Phone..............................................................151
7.15 Using the Boss Admin Feature.................................................................................... 152
7.15.1 Viewing Admins and Bosses........................................................................................152
7.15.2 Handling an Incoming Call for the Boss .......................................................................153
7.15.3 Calling on Behalf of the Boss.......................................................................................154
7.15.3.1 Touching the Boss' icon..........................................................................154
7.15.3.2 Keying in the Destination Phone Number......................................................155

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7.15.3.3 Pressing the CONTACTS Key ......................................................................155
7.15.4 Answering a Call on Boss' Phone ................................................................................156
7.15.5 Admin Hands Off a Call to Boss...................................................................................157
7.15.6 Boss Hands Off a Call to Admin...................................................................................157
7.15.7 Boss Monitors Admins, Seizes a Call Put on Hold by an Admin ...................................158
7.15.8 Admin Sees Who's Call Boss Answered ......................................................................159
7.15.9 Admin Picks up a Call Answered by Boss, Put on Hold by Boss...................................160
7.15.10 Admin 1 Picks up a Call from Admin 2 .........................................................................160
7.15.11 Admin's Phone Notifies Called Party that Admin's Call is on Behalf of Admin's Boss....161
7.15.12 Admin Calling Boss .....................................................................................................161
7.15.13 Admin Calling Someone on Behalf of Boss..................................................................161
7.16 Configuring Distinctive Ringing on Admin's Phone ...................................................... 162
7.16.1 Setting a Different Volume for Each Boss’s Ringtone ...................................................162
7.17 Viewing and Playing Voicemail Messages .................................................................. 163
7.17.1 Sending an Incoming Call Directly to Voicemail ...........................................................164
7.17.2 Calling a Contact’s Voicemail Directly..........................................................................164
7.17.3 Sending an Existing Call to My Voicemail ....................................................................165
7.17.4 Sending an Existing Call with Contact X to the Voicemail of Contact Y.........................165
8Troubleshooting ......................................................................................................167
8.1 Uploading Logs to Microsoft Server for Support Purposes .......................................... 168

User's Manual Contents
7 C450HD IP Phone
List of Figures
Figure 2-1: Front View.................................................................................................................................14
Figure 2-2: Rear View .................................................................................................................................16
Figure 2-3: Cabling .....................................................................................................................................17
Figure 3-1: Touch Screen in Idle State ........................................................................................................21
Figure 3-2: Menu Screen ............................................................................................................................24
Figure 3-3: Menus.......................................................................................................................................25
Figure 3-4: Alphanumerical Selection..........................................................................................................26
Figure 3-5: Entering a Symbol (e.g., a dot) ..................................................................................................27
Figure 3-6: Reverting to Letters (e.g., abc) ..................................................................................................27
Figure 3-7: Enter the Web URL Displayed in the Phone Screen ..................................................................31
Figure 3-8: Login.........................................................................................................................................37
Figure 3-9: Web Interface – Home Page .....................................................................................................37
Figure 3-10: Sign-in – Content Blocked Page ..............................................................................................38
Figure 3-11: Sign-in – Windows Security Prompt.........................................................................................38
Figure 3-12: Windows Security Prompt .......................................................................................................39
Figure 3-13: Sign-out ..................................................................................................................................39
Figure 5-1: C450HD Phone with Speed Dials Configured in the Expansion Module Screen ........................81
Figure 5-2: Configuring a Speed Dial in the Expansion Module Screen.......................................................81
Figure 5-3: Selecting the Private Option in Microsoft Exchange ...................................................................94
Figure 7-1: InstallShield Wizard – Preparing to Install................................................................................130
Figure 7-2: Welcome to the InstallShield Wizard........................................................................................130
Figure 7-3: License Agreement .................................................................................................................131
Figure 7-4: License Agreement .................................................................................................................131
Figure 7-5: Destination Folder...................................................................................................................132
Figure 7-6: Change Current Destination Folder .........................................................................................132
Figure 7-7: Ready to Install .......................................................................................................................133
Figure 7-8: Installing AudioCodes Better2Gether.......................................................................................133
Figure 7-9: InstallShield Wizard Completed...............................................................................................134
Figure 7-10: AudioCodes Icon in Taskbar..................................................................................................134
Figure 7-11: Control Panel>Programs>AudioCodes Better2Gether ...........................................................135
Figure 7-12: Computer Management > Services and Applications.............................................................135
Figure 7-13: Device Manager > AudioCodes B2GoE USB Driver...............................................................136
Figure 7-14: Popup Menu..........................................................................................................................137
Figure 7-15: About AC BToE.....................................................................................................................137
Figure 7-16: TCP Port...............................................................................................................................137
Figure 7-17: AC BToE TCP Port ...............................................................................................................138
Figure 7-18: Popup Menu..........................................................................................................................140
Figure 7-19: Phone Pairing .......................................................................................................................140
Figure 7-20: AC BToE Failed Indication ....................................................................................................140
Figure 7-21: AC BToE is Connected Indication..........................................................................................140
Figure 7-22: Popup Menu: 'Disconnect' Enabled, 'Phone Pairing' Disabled................................................141
Figure 7-23: BToE Disconnected...............................................................................................................141
Figure 7-24: Popup Menu: BToE Disconnected.........................................................................................141
Figure 7-25: Start > Programs > AudioCodes > BToE Controller ...............................................................142
Figure 7-26: Skype for Business Sign-in Request Prompt..........................................................................143
Figure 7-27: Primary Device: Phone..........................................................................................................149
Figure 7-28: Primary Device: Speaker.......................................................................................................150
Figure 7-29: Primary Device: Headset.......................................................................................................150

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User's Manual 8 Document #: LTRT-13261
List of Tables
Table 2-1: Font View Description.................................................................................................................14
Table 2-2: Rear View Description................................................................................................................16
Table 3-1: Touch Screen in Idle State .........................................................................................................21
Table 3-2: Softkey Descriptions...................................................................................................................22
Table 3-3: Menu Descriptions......................................................................................................................24
Table 3-4: Displayed Messages Indicating Processes In Progress...............................................................41
Table 5-1: Screen Brightness Options.........................................................................................................58
Table 5-2: Presence Statuses .....................................................................................................................90
Table 5-3: Meeting Status [Applies to Non-Microsoft Theme Screen]...........................................................93
Table 7-1: Popup Menu Items – Touch to Activate ....................................................................................112
Table 7-2: Boss-Admin Icons ....................................................................................................................152
Table 8-1: Troubleshooting .......................................................................................................................167

User's Manual Notices
9 C450HD IP Phone
Notice
Information contained in this document is believed to be accurate and reliable at the time of printing.
However, due to ongoing product improvements and revisions, AudioCodes cannot guarantee
accuracy of printed material after the Date Published nor can it accept responsibility for errors or
omissions. Updates to this document can be downloaded from
https://www.audiocodes.com/library/technical-documents.
This document is subject to change without notice.
Date Published: Feb-04-2019
Trademarks
AudioCodes Ltd. All rights reserved. AudioCodes, AC, HD VoIP, HD VoIP Sounds Better,
IPmedia, Mediant, MediaPack, What’s Inside Matters, OSN, SmartTAP, VMAS, VoIPerfect,
VoIPerfectHD, Your Gateway To VoIP, 3GX, VocaNom, AudioCodes One Voice and CloudBond
are trademarks or registered trademarks of AudioCodes Limited All other products or trademarks
are property of their respective owners. Product specifications are subject to change without
notice.
WEEE EU Directive
Pursuant to the WEEE EU Directive, electronic and electrical waste must not be disposed of with
unsorted waste. Please contact your local recycling authority for disposal of this product.
Customer Support
Customer technical support and services are provided by AudioCodes or by an authorized
AudioCodes Service Partner. For more information on how to buy technical support for
AudioCodes products and for contact information, please visit our Web site at
https://www.audiocodes.com/services-support/maintenance-and-support.
Stay in the Loop with AudioCodes
Abbreviations and Terminology
Each abbreviation, unless widely used, is spelled out in full when first used.
Documentation Feedback
AudioCodes continually strives to produce high quality documentation. If you have any comments
(suggestions or errors) regarding this document, please fill out the Documentation Feedback form
on our Web site at http://online.audiocodes.com/documentation-feedback.

C450HD IP Phone
User's Manual 10 Document #: LTRT-13261
Related Documentation
Document Name
400HD Series IP Phones for Microsoft Skype for Business Release Notes
400HD Series IP Phones for Microsoft Skype for Business Administrator’s Manual
C450HD IP Phone for Microsoft Skype for Business Quick Guide
400HD Series IP Phones for Skype for Business Hosting Partner (LHPv2) Environment Configuration Note

User's Manual 1. Introduction
11 C450HD IP Phone
1 Introduction
AudioCodes' C450HD IP Phone is a high-end, executive phone model delivering high-definition
enterprise voice within Skype for Business unified communications environments.
The main feature differentiating this model from the other IP phone models in AudioCodes'
400HD IP Phones Series is its large 5-inch color capacitive 1280 x 720 high-resolution touch
(TFT) screen, with an intuitive touch-oriented user interface design. This touch screen user
interface enables up to eight Function Keys with multi-lingual support.
The phone supports Gigabit Ethernet (two GbE interfaces are supported). The phone also
features support for two USB ports for headset support and an optional expansion module. Skype
for Business certification is pending.
1.1 Highlights
Highlighted features of the C450HD model are:
One line, up to eight concurrent calls
5-inch color capacitive 1280 x 720 high-resolution touch (TFT) screen
Highly intuitive, touch-oriented user interface enabling up to 8 Function softkeys and
extensive unified communications functionality
Multi-lingual support
Expansion module support
Skype for Business certification (pending)
Conferencing and multi-call management, contacts’ photos display, and more.
High-definition call quality with multiple voice coder support
Part of AudioCodes' IP phone management which defines it as an IT-managed entity.
Two Gigabit Ethernet (GbE) interfaces supported - two USB ports for headset support, one
USB headset at a time.
Wireless connectivity:
•Single band 2.4GHz, 802.11b/g/n Wi-Fi support
•Bluetooth 4.2
Note that Bluetooth and Wi-Fi is supported in the USA, Canada, the European Union,
Switzerland and Israel, and requires a specific CPN with a ‘BW’ suffix. The list of supported
countries is dynamic. Contact your local AudioCodes representative for more information
about regional availability and specific country type approvals of Wi-Fi / Bluetooth.
1.2 Unified Communications
Designed especially for use within unified communications environments, including Skype for
Business Online, the C450HD provides built-in support for the industry’s leading voice codecs
with the exception of SILK to offer high voice quality even under poor network conditions.
1.3 Management
Along with the other members of the AudioCodes 400HD IP phone family, it can be deployed as
part of a fully managed IP phone solution, with unique and complete centralized device life-cycle
management courtesy of AudioCodes' IP phone management utilities for managing end-user
desktop devices.
Read this User’s Manual carefully to learn how to operate the product and take full advantage of
its rich feature set.

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User's Manual 2. Setting up the Phone
13 C450HD IP Phone
2 Setting up the Phone
2.1 Unpacking
When unpacking, ensure that the following items are present and undamaged:
Phone / Stand Handset / Cord
Cat 5e Ethernet Cable AC Power Adapter (Optional)
If anything appears to be missing or broken, contact the distributor from whom you purchased the
phone for assistance.

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User's Manual 14 Document #: LTRT-13261
2.2 Device Description
Use the graphics below to identify and familiarize yourself with the device's hardware functions.
2.2.1 Front View
The front view of the phone is shown in Figure 2-1 and described in Table 2-1.
Figure 2-1: Front View
`
Table 2-1: Font View Description
Item # Label/Name Description
1
Ring LED
Indicates phone status:
Green: Idle state
Flashing blue: Incoming call (ringing)
Red: Answered call
2 TFT touch
screen
Thin Film Transistor touch screen, a type of LCD (Liquid Crystal Display)
interactive screen which displays calling information and lets you configure
phone features by touching the glass.
3
Navigation
Press the button's upper rim to scroll up menus/items in the touch screen.
1
3
4
5
7
8
9
15
16
17
18
13
12
2
10
14
6
11

User's Manual 2. Setting up the Phone
15 C450HD IP Phone
Item # Label/Name Description
Control /OK

Press the button's lower rim to scroll down.
Press the button's left or right rim to move the cursor left or right (when
editing a contact number for example).
Press
OK
to select a menu/item/option.
4
Voicemail
Retrieves voicemail messages.
5 CONTACTS Press to directly access the 'Favorites' directory. Other directories can be
accessed from the 'Favorites' screen.
6
MENU
Accesses menus:
Call Log
Calendar
Keys
Settings
Device Status
Administration
Favorites

Log upload.
7
REDIAL
Accesses a list of recently dialed numbers; one can be selected to redial.
8
Kensington lock
Allows locking the device.
9
TRANSFER
Transfers a call.
10
HOLD
Places an active call on hold.
11
Alphanumerical
Keypad
Keys for entering numbers, alphabetical letters and symbols (e.g., colons)
12
Microphone
Allows talking and listening. The network administrator can disable it if
required.
13
SPEAKER
Activates the speaker, allowing a hands-free conversation.
14
HEADSET
Activates a call using an external headset.
15
MUTE
Mutes a call.
16
17
▲ VOL
Increases or decreases the volume of the handset, headset, speaker, ring
tone and call progress tones.
▼ VOL
18
x
Cancel an action, such as dialing a number, after beginning it.

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2.2.2 Rear View
The rear view of the phone is shown in the figure below and described in the table below.
Figure 2-2: Rear View
Table 2-2: Rear View Description
# Label Description
Handset jack, i.e., port RJ-9, to connect the handset.
RJ-45 port to connect to the Ethernet LAN cable for the LAN connection
(uplink - 10/100/1000 Mbps). If you're using Power over Ethernet (PoE),
power to the phone is supplied from the Ethernet cable (draws power
from either a spare line or a signal line).
RJ-45 port to connect the phone to a PC (10/100/1000 Mbps downlink).
12V DC power jack that connects to the AC power adapter.
Headset jack, i.e., RJ-9 port that connects to an external headset.
1
2
3
4
5
2
3
4
5
1

User's Manual 2. Setting up the Phone
17 C450HD IP Phone
2.3 Cabling
This section covers how to cable your phone. Use the figure and table below as reference.
Figure 2-3: Cabling
Action Description
Connect the phone's RJ-9 port to the handset cord's longer, straight end.
Connect the handset to the handset cord's short, straight end.
Connect one of the two USB ports to a headset [optional].
Connect the phone’s power socket labelled DC 12V to the connector tip of the AC power
adapter. Connect the two-prong AC adapter directly to the electrical wall outlet.
When the phone powers up, all the LEDs momentarily light up.
Connect the phone's RJ-9 headset jack to a headset [optional]
Connect the RJ-45 PC port to a computer/laptop, using a CAT 5 / 5e straight-through
Ethernet cable
Connect the phone's RJ-45 LAN port to your LAN network (LAN port or LAN switch/router)
using a CAT 5 / 5e Ethernet cable.
Internal use only. FAEs use the port to debug and troubleshoot the phone - after connecting
the AUX (auxiliary) port to a terminal monitor with a serial cable.
1
2
4
5
6
7
3

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User's Manual 18 Document #: LTRT-13261
Note: If the LAN to which the phone is connected supports Power over Ethernet (PoE), no
AC adapter is required; the phone receives power from the Ethernet network.
Prior to connecting power, refer to the Compliancy and Regulatory Information at
www.audiocodes.com/library.
2.4 Mounting the Phone
The phone can be mounted on a:
Desk (see Section 2.4.1 below)
Wall (see Section 2.4.3)
See also https://www.youtube.com/watch?v=oGe9STB9lFE to assemble the base stand.
2.4.1 Desktop Mounting
This section shows how to mount the phone on a flat surface like a desk.
To mount the phone on a flat surface like a desk:
1. Off-hook the handset (if on-hook) and place the phone upside down, i.e., base-up, on your
desktop.
2. On the phone's stand, identify outer notches.
3. On the phone's base, identify outer rails.
4. Invert the stand and align its outer notches with the base's outer rails.
5. Insert the stand's outer notches into the base's outer rails and slide the notches along the
rails until the stand click-locks into the base.
6. Revert the phone and stand it on the desktop.
2.4.2 Mounting the Expansion Unit on a Desktop
Note: Only applies to C450HD phone users with the Expansion Unit option.
A dedicated stand is supplied for the Expansion Unit. Its mounting mechanism is identical to the
phone's (see the previous section for more information).
2.4.2.1 Routing the Handset Cable
The phone features a groove for routing the handset cable.

User's Manual 2. Setting up the Phone
19 C450HD IP Phone
2.4.3 Wall Mounting
This section shows how to mount the phone on a wall.
To mount the phone on a wall:
1. Attach the stand of the phone for the purpose of a wall mounting:
a. Detach the base.
b. Attach it again as you did for a desktop mounting (see Section 2.4.1) only now make
sure that it's flatly aligned to lie flush against the wall, i.e., slide the inner rails of the
phone stand onto the phone base's inner notches.
2. Connect the AC power adapter, LAN and PC/laptop cords.
3. In the wall, drill two horizontal holes at a distance of 3 15/16 inches (100 mm) from one
another, in line with the template.
4. Insert two masonry anchors into the holes if necessary.
5. Thread two screws (not supplied) into the two masonary anchors; ensure that the heads
extend sufficiently (about 3/16 inch or 5 mm from the wall) for the phone stand's keyhole
slots to hang on.
6. Hang the phone stand's keyhole slots on these screws.

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