AudioCodes 400HD Series User manual

User's and Administrator's Manual
AudioCodes 400HD IP Phone Series
C448HD | C450HD IP
Phones
Microsoft Teams Application
Version 1.10
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Notice C448HD and C450HD | Users & Administrator's Manual
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: July-13-2021
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  website  at 
https://www.audiocodes.com/services-support/maintenance-and-support.
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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websiteathttps://online.audiocodes.com/documentation-feedback.
Stay in the Loop with AudioCodes
Related Documentation
Document Name
C450HDandC448HDIPPhoneforMicrosoftTeamsQuickGuide
C450HDandC448HDIPPhoneforMicrosoftTeamsReleaseNotes
https://docs.microsoft.com/en-us/MicrosoftTeams/phones-for-teams

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Content C448HD and C450HD | Users & Administrator's Manual
Table of Contents
1 Overview 1
Specifications 1
Allowing URLs, Ports (Security) 4
Security Guidelines for Android-based Native Teams Devices 5
Android-Level Security Hardening 6
Google Play Services 6
Running Android in Kiosk Mode 6
Screen Lock 7
AudioCodes Private Key 7
Android Debug Bridge (ADB) 7
App Signing 7
Web Browser 7
Remote Configuration Management 7
AudioCodes Device Manager Validation 8
Sandboxing 8
Device File System 8
Keystore 8
Device Certificate 8
Data Protection 8
Debugging Interface 8
Android Security Updates 9
AudioCodes Root CA Certificate 9
2 Setting up the Phone 12
Unpacking 12
Device Description 13
Front View 13
Rear View 16
Cabling 17
Mounting the Phone 17
Desktop Mounting 17
Wall Mounting 17
Before Using AudioCodes Devices 18
3 Starting up 20
Configuring Device Settings 20
Configuring Wi-Fi 33
Restoring the Phone to Default Settings 35
Performing a Hard Restore 35
Performing a Soft Restore 36
Recovery Mode 36
Locking and Unlocking the Phone 36
Automatic Lock 37
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Content C448HD and C450HD | Users & Administrator's Manual
Unlock 37
4 Teams Application 39
Signing In 39
Multi-Cloud Sign-in 43
Remote Provisioning and Sign-in from Teams Admin Center 44
Getting Acquainted with the Phone Screen 48
Enabling Google Talkback 50
Opting in or out of Call Queues 51
Setting Status 51
Hot Desking 52
Changing Presence Status 53
Configuring Teams Application Settings 54
Setting up a Meeting 57
Using the People Screen 58
Accessing Voicemail 58
Using Audio Devices 59
Transferring Calls and Meetings across Devices 60
Signing Out 60
5 Performing Teams Call Operations 62
Making a Call 62
Redialing 63
Dialing a Missed Call 63
Select to Dial 63
Making an Emergency Call 63
Answering Calls 65
Ending an Established Call 65
Managing Calls 65
Parking a Call 65
Managing Teams Meetings 66
Using Live Captions 68
Raising a Hand During a Meeting 69
Transferring a Call to Frequent Contacts 69
Transferring a Call to Work Voicemail 69
Viewing and Playing Voicemail Messages 69
Rejecting an Incoming Call, Sending it Directly to Voicemail 70
Adjusting Volume 70
Adjusting Ring Volume 70
Adjusting Tones Volume 71
Adjusting Handset Volume 71
Adjusting Speaker Volume 71
Adjusting Headset Volume 71
Viewing and Joining Meetings 71
Adding a Speed Dial 73
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Content C448HD and C450HD | Users & Administrator's Manual
6 Performing Administrator-Related Operations 75
Updating Phone Firmware Manually 75
Downloading 802.1x Certificates 77
AudioCodes Teams IP Phone Utility 77
Manually Performing Recovery Operations 78
Removing Devices from Intune Management 79
Updating Microsoft Teams Devices Remotely 86
Managing Phones with the Device Manager 87
Configuring a Periodic Provisioning Cycle 88
Configuring TimeZone and Daylight Savings 88
Managing Devices with HTTPS 89
Supported Parameters 89
7 Troubleshooting 92
Users 92
Network Administrators 92
Teams IP Phone Utility 92
Capturing the Phone Screen 94
Running Tcpdump 96
Getting Information about Phones 97
Remote Logging (Syslog) 99
Getting Diagnostics 100
Getting a Bug Report 103
Activating DSP Recording 104
Deactivating DSP Recording 105
SSH 106
Getting the Phone IP Address 106
Installing the Teams APK (or Any Other APK) using SSH 106
Microsoft Admin Center 107
Collecting Logs 107
Getting Company Portal Logs 109
Getting Logs via the Phone 109
Getting Logs using UUID 110
Getting Audio Debug Recording Logs 112
Collecting Media Logs (*.blog) from the Phone 113
Capturing Traffic Using 'rpcapd' 113
Port Mirroring Network Monitoring 114
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
1 Overview
The  AudioCodes  C448HD  and  C450HD  IP  phones  are  native  Microsoft  Teams  high- end 
executivebusiness phones with a largecolortouch screen and fullUC integration  for the
NativeMicrosoftTeamsOnlinemarket.
TheMicrosoftTeamsC448HDandC450HDphonesareequippedwitha5-inchcolorcapacitive
touchscreenof1280x720resolution.
The C448HD phone is identical to the C450HD phone from the user's point of view,
with the exception of:
●The C448HD phone does not allow the 'Switch to Skype' feature (in the Admin
debugging tab); the C450HD allows this feature.
●The C448HD phone does not feature Bluetooth and Wi-Fi; the C450HD phone
features optional integrated Wi-Fi and Bluetooth support (contact your local
AudioCodes representative for more information about regional availability).
●The C448HD phone features one USB port; the C450HD phone features two.
●The C448HD phone does not feature an option to add the Expansion Module; the
C450HD phone features this option.
ThephonescanbemanagedbytheMicrosoftTeams&SkypeforBusinessAdminCenter.For
moreinformation,seehttps://docs.microsoft.com/en-us/MicrosoftTeams/phones-for-teams.
AudioCodes'  Device  Manager  and  AudioCodes'  Redirect  Server  are  also  supported  for 
monitoring,upgradingandconfiguringthedevices.
ThephonesfeaturetheoptiontobeusedasaMicrosoftTeamsCompatibleIPphone,offered
as part of AudioCodes’ Managed IPPhones solution which defines theIPphoneas an IT-
managedentityanddeliversuniqueandcompletelifecyclemanagementofend-userdesktop
devices.
Specifications
ThefollowingtablesummarizesthesoftwarespecificationsoftheAudioCodesIPphonesfor
MicrosoftTeams.
Table 1-1: Software Specifications
Feature Details
Media
Processing
■VoiceCoders:G.711,G.729,G.722,SILKOpus
■AcousticEchoCancelation:G.168-2004compliant,64-msectail
length
■AdaptiveJitterBuffer
■VoiceActivityDetection
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
Feature Details
■ComfortNoiseGeneration
■PacketLostConcealment
■RTP/RTCPPacketization(RFC3550,RFC3551),SRTP(RFC3711)
Microsoft
Teamsphones
featureset
■Authentication(Signinwithusercredentials;Signinusing
PC/Smartphone;ModernAuthentication;Phonelock/unlock)
■Calling(Incoming/OutgoingP2Pcalls;In-callcontrolsviaUI(Mute,
hold/resume,transfer,endcall);PSTNcalls;VisualVoicemail;911
support
■CalendarandPresence(roadmapfeature)(CalendarAccessand
MeetingDetails;PresenceIntegration;ExchangeCalendar
Integration;ContactPictureIntegration;CorporateDirectory
Access)
■Meetings(roadmapfeature)(One-clickJoinforMeetings;Join
SkypeforBusinessmeetings;MeetingCallcontrols[Mute/unmute,
hold/resume,hangup,add/removeparticipant];MeetingDetails.
Seealsohere.
Configuration
and
Management
■MicrosoftTeams&SkypeforBusinessAdminCenter(Provisioning
andLogging)
■AudioCodesDeviceManagementandAudioCodesRedirectServer
formonitoring,upgradingandconfiguring
Debugging
Tools
■AudioCodes'TeamsIPPhoneUtility(seeTeamsIPPhoneUtilityon
page92)
■LoguploadtoMicrosoftserver(certificationfor3rdpartySkypefor
Businessclients)
■RemoteloggingviaSyslog
■SSHAccess
■Capturingthephonescreen
■TCPdump
■CompanyPortal(Intune)logs
■AudioDebugrecordinglogs
■Medialogs(*.blog)
■Portmirroringnetworkmonitoring(C450HD)
■RemotePacketCapturenetworksnifferapplication
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
Feature Details
Localization
Support
■Multi-lingualsupport;thelanguagepacklistisnotyetfinalandis
subjecttomodification.
Hardware ■Five-inchcolorcapacitivetouchscreen,1280x720resolution,with
anintuitiveuserinterface.
■Wiredconnectivity:
✔TwoRJ-45[GigabitEthernet(GbE)](10/100/1000BaseT
Ethernet)ports:LANandPCport
✔RJ-9port(jack)forheadset
✔[C450HD]2xUSBportsforheadsetsupport(1xUSBportcan
beusedatatime).
C450HDwithDBWsuffixflavor:
●White USB port–hostportwhichsupportsUSBheadsets
●Black USB port–configurabledevice/hostport(default
configuration–devicemode)forfutureuseasdeviceport.
Toconfiguredevice/hostport:
setup_usbport2_mode.sh host(fromdevicetohost)
setup_usbport2_mode.sh device(fromhosttodevice)
Itcanalternativelybeconfiguredbysettingtheconfiguration
fileparameter'management/usbport2/mode'tothevalueof
USB_HOST_MODE/USB_DEVICE_MODE
✔[C448HD]1xUSBportforheadsetsupport
✔RJ-11interface
■Wirelessconnectivity(C450HDonly):
✔Dualband2.4GHz/5GHz,802.11b/g/nWi-Fisupport
✔Wi-Fisupportedprotocols:WEP,WPA-PSK/WPA2-PSKand
WPA/WPA2Enterprise(802.1X)PEAPonly
■Bluetoothsupport(C450HDonly);integrated;optional
■ExpansionModule(C450HDonly;optional)
■Mounting:
✔Wallanddesktopmountingoptions
✔Oneanglefordesktopmount,anotherangleforwallmount
■Power:
✔DCjackadapter12V
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
Feature Details
✔PowersupplyAC100~240V
✔PoEClass3:IEEE802.3af(optional)
■Keys:
✔VOICEMAILmessagehotkey(includingLED)
✔4-waynavigationbuttonwithOKkey
✔MENU
✔REDIAL
✔HOLD
✔MUTE(includingLED)
✔TRANSFER
✔VOLUMEcontrolkey
✔HEADSET(includingLED)
✔SPEAKER(includingLED)
✔BACK
✔CONTACTS
Allowing URLs, Ports (Security)
ThissectionguidesnetworkadministratorswhichURLs/PortstoallowwhendeployingTeams
phones(security).
Fromthedevicepointofview,thefollowingtablesummariestheportsthephoneuses.See
alsoMicrosoft'sguidetotheportsthephoneuses.
Table 1-2: URLs / Ports to Allow when Deploying Teams Phones (Security)
Server Role Service Name Port Protocol Notes
DNSServer All 53 DNS -
AudioCodes
Device
Manager
AudioCodes
DM
443 HTTPS AudioCodesdevice
managementserver
AudioCodes
Redirect
service
AudioCodes
DM
443 HTTPS AudioCodesredirectservice
redirect.audiocodes.com
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
Server Role Service Name Port Protocol Notes
NTP
timeserver
AndroidNTP 123 UDP -
TimeZone
Database
TimeZones 443 HTTPS TimeZoneDatabase(often
calledtzorzoneinfo)
Microsoft
AppsArtifacts
server
Package
manager
- - Microsoftwillberequested
fortheprotocolandportand
FQDN.TheseURLsare
providedbytheAdmin
agent.
Security Guidelines for Android-based Native Teams Devices
AudioCodes'Android-basedNativeTeamsdevicesarepurpose-builtandcustomizedfor
MicrosoftTeamscallingandmeeting.CustomersmightperceiveAndroid-basedproductsas
vulnerabletosecurityissuesbutsecurityislessofanissueondevicespurpose-builtandcus-
tomizedforMicrosoftTeamscallingandmeeting.Securityisinfactenhancedonthesedevices
as part of their default use.
Whenanalyzingdevicesecurity,twolevelsmustbeaddressed:
■AuthenticationandsecuritywithrespecttoTeamsconnectivityanduse
■Androidlevel/systemofthedevice
AudioCodesrecommendsthefollowing:
■Usethesign-inmodeSign-in with other device option.Inthismode,usersdonottype
thepasswordonthedevicebutinsteadobtainacodeontheirPC/laptoptobeusedto
sign-in;thephoneobtainsaprivatetokenthatenablesittoaccessTeamscloud;this
token,unlikeapassword,allowsonlythatdevicewhichobtainedittoreuseit.Thetoken
isstoredonthesecuredfilesystem.
■LeverageMulti-Factor-authentication(MFA)toimprovesign-insecurity.
■Reducetheexpirationtimeofthesign-infordeviceswhichareconnectedremotely
(outsidetheorganization'snetwork)versusdevicesinsidetheorganization'spremises.
AudioCodesrecommendsvisitingMicrosoft'stechnicalpagesformoresecurityguidelinesand
policiesforMicrosoftTeamsadoption:
■Overviewofsecurityandcompliance-MicrosoftTeams|MicrosoftDocs
■IdentitymodelsandauthenticationforMicrosoftTeams-MicrosoftTeams|Microsoft
Docs
■SignintoMicrosoftTeams-MicrosoftTeams|MicrosoftDocs
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
Android-Level Security Hardening
MajorAndroid-levelsystem-leveldevelopments have been incorporated into AudioCodes'
NativeTeamsdevicestoimprovesecurity:
■SeeGooglePlayServicesbelow
■SeeRunningAndroidinKioskModebelow
■SeeScreenLockonthenextpage
■SeeAudioCodesPrivateKeyonthenextpage
■SeeAndroidDebugBridge(ADB)onthenextpage
■SeeAppSigningonthenextpage
■SeeWebBrowseronthenextpage
■SeeRemoteConfigurationManagementonthenextpage
■SeeAudioCodesDeviceManagerValidationonpage8
■SeeSandboxingonpage8
■SeeDeviceFileSystemonpage8
■SeeKeystoreonpage8
■SeeDeviceCertificateonpage8
■SeeDataProtectiononpage8
■SeeDebuggingInterfaceonpage8
■SeeAndroidSecurityUpdatesonpage9
Google Play Services
GogglePlayserviceswereremovedfromtheAudioCodesNativeTeamsdevicesoftware.Access
toanyGooglestoreorPlayserviceisnotallowed.
■UpdatingtheAudioCodesNativeTeamsdevice'sAndroidsoftwareandapplicationis
performedviaspecialsoftwarecomponentsthateitherconnecttotheTeamsAdmin
CenterortoAudioCodes'DeviceManageroverasecuredchannel.
Running Android in Kiosk Mode
AndroidKioskLockdownsoftware'locksdown'Androiddevicestoonlyallowessentialappsby
disablingaccesstotheHome/ Launcher.UsingAndroidKiosk Lockdownsoftware,Android
devicescanbeconvertedintopublickioskterminalsorsecuredworkdevices.
■OnlyspecificMicrosoftappsandAudioCodes-signedappsthatwerecertifiedand
approvedinthecertificationprocesscanruninKioskmode;evenifamalicioususer
managestoinstallanewunauthorizedapponthefilesystem,thelauncheronthe
AudioCodesNativeTeamsdevicewillonlyrunthosespecificapprovedappsandthis
cannotbechangedinruntime(onlywithanewsoftwarecodeprovidedbyAudioCodes).
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
Screen Lock
AudioCodes Native Teams  devices use a  screen lock  mechanism  to  prevent  any  malicious 
user/users  from  gaining  access  to  Calendar  information  and  /  or  Active  Directory  list  of 
employeesand/ortriggeringunauthorizedTeamscallsfromthedevice.Afterenablingscreen
lock,thedeviceautomaticallylocksafterapreconfiguredperiod;acodeisrequiredtounlock
thedeviceandresumefulloperation.
AudioCodes Private Key
ThesystemsoftwareonAudioCodesNativeTeamsdevicesissignedwithAudioCodes'private
key.Userscanreplacethecompletesoftwareonlywithnewsoftwarethatisalsosignedby 
AudioCodes'privatekey.
Thispreventsusersfromreplacingthecompleteover-the-air(OTA)packageofthedevicewith
anynewsystemsoftware,unlessthesoftwareisfullysignedbyAudioCodes.
Android Debug Bridge (ADB)
AudioCodesdisabledtheAndroidDebugBridge(ADB)applicationandkeepstheTeamsapp
runninginthefrontallthetime.Asaresult,it'simpossibletoinstallotherappsfromunknown
sources,andtosideloadapps.
App Signing
Android  requires  all  apps  to  be  digitally- signed  with  a  developer  key  before  installation; 
currently,theAudioCodesNativeTeamsdevicesverifythatappsaresignedbyMicrosoft.
Appsigningpreventsmalicioususer/usersfromreplacingaMicrosoft-signedappwithanapp
that  "pretends"  to  be  Microsoft  but  which  lacks  the  private  key  that  is  known  only  to 
Microsoft.
Web Browser
TheAudioCodesNativeTeamsdevicedoesnotincludeaWebbrowser.Userscannotbrowse
tothepublicinternetorinternalintranet.AllWebservicesarecustomizedtoconnecttoOffice
365services and AudioCodes'managed services such  as the One VoiceOperations  Center
(OVOC).
WithoutaWebbrowser,malicioususer/userswillnotbeabletoaccessthedeviceandbrowse
fromitasatrusteddeviceintothecustomernetwork.
Remote Configuration Management
AudioCodesNativeTeamsdevicesdonothaveanembeddedWebserver.Configurationand
managementareperformedusingoneofthefollowingremoteinterfaces:
■MicrosoftTeamsAdminCenter(forNativeTeamsdevices)overHTTPSprotocols,enabled
afterasuccessfulsign-inauthenticationprocess.
■AudioCodesDeviceManager(partofAudioCodes'OVOCsuite)overHTTPS.
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
■DebugginginterfaceoverSSH.NotethatSSHmustbedisabledbydefaultandenabled
onlyperspecificcasefordebuggingpurposesonly.
AudioCodes Device Manager Validation
TheAudioCodesNativeTeamsdevicesvalidatetheAudioCodesDeviceManageridentityusing
aknownRootCA:
■ThedeviceisshippedwithknownRootCAsinstalled.SeeAudioCodesRootCACertificate
onthenextpage.
■Fortheinitialconnection,theAudioCodesDeviceManageraccessesdevicesusinga
knownCA.
■Onceasuccessfulsecuredconnectionhasbeenestablishedbetweenthedeviceandthe
DeviceManager,theusercanreplacetheRootCAontheDeviceManagerandonthe
phone,andre-establishtheconnectionleveraginganyPrivateRootCA.
Sandboxing
AudioCodesNativeTeamsdevicesuseAndroidApplicationSandboxsothateachapplication
canaccessitsowndataandisisolatedfromotherapplications.Thispreventsamaliciousapp
fromaccessingthecodeorthedataofotherapplicationsinthesystem.
Device File System
TheAudioCodesNativeTeamsdevice'sfilesystemisencryptedontheC470HD,C435HDand
C450HD-DBWdevices.Customersmayenforceapolicyofdeviceencryption viaMicrosoft's
cloud-basedIntuneservice.
Keystore
WithAudioCodesNativeTeamsdevices,thecertificatekeysareencryptedonthedevicefile
system.
Device Certificate
AudioCodes NativeTeams devices areshipped with auniquecertificatewhich issigned by 
AudioCodesRootCA.
Data Protection
AudioCodesNativeTeamsdevicesrunAndroidwhichhasintegralproceduresforprotecting
andsecuringuserdata.
Debugging Interface
■TheAudioCodesNativeTeamsdevicesleverageSSHasadebugginginterface.
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
■AudioCodesrecommendsthatcustomersdisableSSHondevicesviaAudioCodes'Device
Manager(OVOC).
■AudioCodesrecommendschangingtheAdminpasswordfromthedefault,viatheTeams
AdminCenterorAudioCodes'DeviceManager(OVOC).
■Whenadevice-ormultipledevices-needstobedebugged,userscanenableSSHonit/
them,accessSSHwiththenewAdminpasswordforthedebuggingphase,anddisableSSH
oncedebuggingisfinished.
Android Security Updates
AudioCodesregularlyadoptsandintegratesAndroidsecurityupdates.
Forreference,seehere.
AudioCodes Root CA Certificate
ThefollowingfigureshowstheAudioCodesRootCACertificate.
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CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
-----BEGIN CERTIFICATE-----
MIIDMTCCAhmgAwIBAgIBATANBgkqhkiG9w0BAQsFADAfMQwwCgYDVQQK
EwNBQ0wx
DzANBgNVBAMTBlJvb3RDQTAeFw0wMDAxMDEwMDAwMDBaFw0zMDAxM
DEwMDAwMDBa
MB8xDDAKBgNVBAoTA0FDTDEPMA0GA1UEAxMGUm9vdENBMIIBIjANBgkq
hkiG9w0B
AQEFAAOCAQ8AMIIBCgKCAQEA6GK495KUCXAm/UE17G4/cjnZN4LNaxYE
YzbfZL0a
EhgSKYt/LQ+iUcDhojsneusNgrcGkpwKklKsGsvGWmSRNULV01CW+TX2VJN7
3+hh
V0uzhyOIYAUhbDaoqNM6Kp5b7sJ1ew4Ig9kfd/ma9Czl5koESLlw/inLj/r+rD96
mUcPElWrKspv7Qy4I14fsK/yMArixRopTL1munVVPpSFM9Jh8IY3JHyr5CQJXK
Ks
EhGAJsnHaRqsR2Su3X/WtslgEF+cvP34pxhlhFL29nMfnaFATSS3rgGaFlSvl1ZS
esLMqkWjp9cqGYrvt7K61sYnvMMb+o/KbWqVokXb+Fr7bwIDAQABo3gwdjAMB
gNV
HRMEBTADAQH/MB0GA1UdDgQWBBQDXySn9hz15lDraZ+iXddZGReB+zBH
BgNVHSME
QDA+gBQDXySn9hz15lDraZ+iXddZGReB+6EjpCEwHzEMMAoGA1UEChMDQ
UNMMQ8w
DQYDVQQDEwZSb290Q0GCAQEwDQYJKoZIhvcNAQELBQADggEBAI0rUyw
ommWWJnH3
JOfKiS3+VnX5hJITZymvWanMXUz/6FonHccPXEBYTrUYwhiWx3dwELAFXDF
KkxMp
0KKWZ4F39cAOLRjqhzya+xUeeJ9HQZCXYAJ6XgvTfN2BtyZk9Ma8WG+H1hN
vvTZY
QLbWsjQdu4eFniEufeYDke1jQ6800LwMlFlc59hMQCeJTenRx4HdJbJV86k1gBU
E
A7fJT1ePrRnXNDRz6QtADWoX3OmN7Meqen/roTwvLpEP22nYwvB28dq3Jetl
QKwu
- 10 -

CHAPTER1 Overview C448HD and C450HD | Users & Administrator's Manual
XC4gwI/o8K2wo3pySLU9Y/vanxXCr0/en5l3RDz1YpYWmQwHA8jJIu8rxdhr+VN
Q
Zv6R/Ys=
-----END CERTIFICATE----
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CHAPTER2 Setting up the Phone C448HD and C450HD | Users & Administrator's Manual
2 Setting up the Phone
Unpacking
When unpacking, makesure the items listed in thephone's Quick Guidearepresent and 
undamaged.
If  anything  appears  to  be  missing  or  broken,  contact  the  distributor  from  whom  you 
purchasedthephoneforassistance.
Fordetailedinformation,seethephone'sQuick Guideshippedwiththedeviceoravailable
fromAudioCodes.
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CHAPTER2 Setting up the Phone C448HD and C450HD | Users & Administrator's Manual
Device Description
Use thefollowing  graphics to  identify and  familiarizeyourselfwith  the device's  hardware
functions.
Front View
Thefrontviewofthephoneisshowninthefigureanddescribedinthetable.
Figure 2-1: Front View
Table 2-1: Font View Description
Item # Label/Name Description
1RingLED Indicatesphonestatus:
■Green:Idlestate
■Flashingred:Incomingcall(ringing)
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CHAPTER2 Setting up the Phone C448HD and C450HD | Users & Administrator's Manual
Item # Label/Name Description
■Red:Answeredcall
2TFT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.
3NavigationControl
/OK
■Pressthebutton'supperrimtoscrollup
menus/items.
■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.
4Voicemail Retrievesvoicemailmessages.
5CONTACTS AccessesthePeoplescreen.
6MENU AccessestheSettingsscreen.
7REDIAL Accessesalistofrecentlydialednumbers;onecanbe
selectedtoredial.
8Kensingtonlock Allowslockingthedevice.
9TRANSFER 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.
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CHAPTER2 Setting up the Phone C448HD and C450HD | Users & Administrator's Manual
Item # Label/Name Description
1617 ▲VOL Increasesordecreasesthevolumeofthehandset,
headset,speaker,ringtoneandcallprogresstones.
▼VOL
18 'Back'key Returnsyoutothepreviousscreen.
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