AudioCodes C455HD Series User manual

User's and Administrator's Manual
AudioCodes 400HD IP Phone Series
C455HD IP Phone
Microsoft Teams Application
Version 1.15



Notice C455HD | 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: February-07-2022
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.
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websiteathttps://online.audiocodes.com/documentation-feedback.
Stay in the Loop with AudioCodes
Related Documentation
Document Name
C455HDIPPhoneforMicrosoftTeamsReleaseNotes
C455HDIPPhoneforMicrosoftTeamsQuickGuide
DeviceManagerAdministrator'sManual
- ii -

Notice C455HD | Users & Administrator's Manual
Document Name
DeviceManagerDeploymentGuide
https://docs.microsoft.com/en-us/MicrosoftTeams/phones-for-teams

- iii -

Content C455HD | 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 9
Debugging Interface 9
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
Installing the Expansion Module (Sidecar) 18
Before Using AudioCodes Devices 19
3 Starting up 20
Configuring Device Settings 20
Configuring Wi-Fi 33
Restoring the Phone to Default Settings 34
Performing a Hard Restore 35
Performing a Soft Restore 35
Recovery Mode 36
Locking and Unlocking the Phone 36
- iv -

Content C455HD | Users & Administrator's Manual
Automatic Lock 36
Unlock 36
4 Teams Application 38
Signing In 38
Multi-Cloud Sign-in 42
Remote Provisioning and Sign-in from Teams Admin Center 43
Getting Acquainted with the Phone Screen 47
Enabling Google Talkback 49
Opting in or out of Call Queues 50
Setting Status 50
Hot Desking 51
Changing Presence Status 52
Configuring Teams Application Settings 53
Setting up a Meeting 56
Using the People Screen 57
Accessing Voicemail 58
Using Audio Devices 58
Transferring Calls and Meetings across Devices 59
Signing Out 59
5 Performing Teams Call Operations 61
Making a Call 61
Redialing 62
Dialing a Missed Call 62
Select to Dial 62
Making an Emergency Call 62
Answering Calls 63
Ending an Established Call 64
Managing Calls 64
Parking a Call 64
Managing Teams Meetings 65
Using Live Captions 67
Raising a Hand During a Meeting 68
Hiding Names and Meeting Titles for Individual Devices 68
Transferring a Call to Frequent Contacts 68
Transferring a Call to Work Voicemail 68
Viewing and Playing Voicemail Messages 69
Rejecting an Incoming Call, Sending it Directly to Voicemail 69
Adjusting Volume 69
Adjusting Ring Volume 70
Adjusting Tones Volume 70
Adjusting Handset Volume 70
Adjusting Speaker Volume 70
Adjusting Headset Volume 70
-v-

Content C455HD | Users & Administrator's Manual
Playing Incoming Call Ringing through USB Headset 71
Using the Phone as a USB Speaker 71
Viewing and Joining Meetings 71
Adding a Speed Dial 72
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
Applying Firmware to a Phone from a USB Disk 87
Managing Phones with the Device Manager 87
Configuring a Periodic Provisioning Cycle 88
Configuring TimeZone and Daylight Savings 89
Managing Devices with HTTPS 90
Supported Parameters 90
7 Troubleshooting 92
DSCP 92
Users 93
Network Administrators 94
Teams IP Phone Utility 94
Capturing the Phone Screen 96
Running Tcpdump 98
Getting Information about Phones 99
Remote Logging (Syslog) 101
Getting Diagnostics 102
Getting a Bug Report 105
Activating DSP Recording 106
Deactivating DSP Recording 107
SSH 108
Getting the Phone IP Address 108
Installing the Teams APK (or Any Other APK) using SSH 108
Microsoft Admin Center 109
Collecting Logs 109
Getting Company Portal Logs 111
Getting Logs via the Phone 111
Getting Logs using UUID 112
Getting Audio Debug Recording Logs 114
Collecting Media Logs (*.blog) from the Phone 115
Capturing Traffic Using 'rpcapd' 115
Port Mirroring Network Monitoring 116
- vi -

CHAPTER1 Overview C455HD | Users & Administrator's Manual
1 Overview
TheAudioCodesC455HDIPphoneisahigh-end,nativeMicrosoftTeamsexecutiveIPphone
withalarge,color5”touchscreen,integratedBluetoothandWi-Fi,andoptionalconnectivityto
acolortouchscreenExpansionModule.
Featurehighlights:
■Fullduplexspeakerphoneandheadsetconnectivity
■Graphical5”colorcapacitivetouchscreen(1280X720resolution)
■Multi-lingualsupport
■DualGbEsupport
■PoEorexternalpowersupply
■USBportforUSBheadset
■ApplicabletopartnumberC455HD-DBW:
●IntegratedBluetoothandWi-Fi(contactyourlocalAudioCodesrepresentativeformore
informationaboutregionalavailabilityofWi-Fi/Bluetooth)
●OptionalExpansionModulesupportwithagraphical5”colorcapacitivetouchscreen,
480X854resolution(theExpansionModuleispurchasedseparately)
SeealsohereaguidetoAudioCodesdevices.
Seealsoherea'Howto'presentation,includingavideoclip.
Seealsohereanadvanced'Howto'videoblog.
Specifications
Thefollowingtablesummarizesthephone'ssoftwarespecifications.
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
■Ambientnoiseblock
■AdaptiveJitterBuffer
■VoiceActivityDetection
■ComfortNoiseGeneration
■PacketLostConcealment
-1-

CHAPTER1 Overview C455HD | Users & Administrator's Manual
Feature Details
■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forrelatedMicrosoftdocumentation.
Configuration
and
Management
■Teamsadmincenter(TAC)
■OVOC/DeviceManager
Debugging
Tools
■AudioCodes'TeamsIPPhoneUtility(seeTeamsIPPhoneUtilityon
page94)
■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
■RemotePacketCapturenetworksnifferapplication
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
-2-

CHAPTER1 Overview C455HD | Users & Administrator's Manual
Feature Details
anintuitiveuserinterface.
■Wiredconnectivity:
✔TwoRJ-45[GigabitEthernet(GbE)](10/100/1000BaseT
Ethernet)ports:LANandPCport
✔USBportforUSBheadset
C455HDwithDBWsuffixflavor:
●White USB port-hostportforUSBheadset
●Black USB port-defaultportbutcanbeconfiguredtohost
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
✔RJ-11interface
✔SurvivableBranchAppliance(SBA)
■Wirelessconnectivity(appliestoPNsTEAMS-C455HD-DBWand
TEAMS-C455HDPS-DBW):
✔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
■IntegratedoptionalBluetoothsupportfor(appliestoPNsTEAMS-
C455HD-DBWandTEAMS-C455HDPS-DBW):
✔Bluetoothheadsets
✔MicrosoftBetterTogetherfordevicepairing
■BluetoothWidebandSpeech(WBS)supportedforheadsets
■ExpansionModule(optional)
■Mounting:
✔Wallanddesktopmountingoptions
✔Oneanglefordesktopmount,anotherangleforwallmount
■Power:
✔DCjackadapter12V
-3-

CHAPTER1 Overview C455HD | Users & Administrator's Manual
Feature Details
✔PowersupplyAC100~240V
✔PoEClass2:IEEE802.3af(optional)
■Keys:
✔VOICEMAILmessagehotkey(includingLED)
✔4-waynavigationbuttonwithOKkey
✔MENU
✔HOLD
✔MUTE(includingLED)
✔TRANSFER
✔VOLUMEcontrolkey
✔HEADSET(includingLED)
✔SPEAKER(includingLED)
✔BACK
✔CONTACTS
✔ACkey–forfutureuse–currentlyusedashomekey
Allowing URLs, Ports (Security)
Thissectionshows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
-4-

CHAPTER1 Overview C455HD | 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vul-
nerable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
-5-

CHAPTER1 Overview C455HD | 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9
■SeeDebuggingInterfaceonpage9
■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).
-6-

CHAPTER1 Overview C455HD | 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)
The device does not allow access to 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:
-7-

CHAPTER1 Overview C455HD | Users & Administrator's Manual
■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.
■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455HDdevices.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.Networkadministratorscaninstallathird-partycertificateontheTeams
phone  in  the  customer’s  trusted  environment.  Network  administrators  should  follow  the 
followingguidelineswhenreplacingtheexistingtrustedCAs:
■ThedevicecertificateURLwillonlybevalidifnoSCEPserverURLispresent
■Usethefollowingtwoparameterstosetthedevicecertificateinthephone'sconfiguration
file:
●security/device_certificate_url=http://<server-ip>/device.crt
-8-

CHAPTER1 Overview C455HD | Users & Administrator's Manual
●security/device_private_key_url=http://<server-ip>/device.key
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.
■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.
SSH is by default disabled and can be enabled with Administrator permissions in the
phone screen (Device Administration > Debugging > SSH).
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.
-9-

CHAPTER1 Overview C455HD | Users & Administrator's Manual
-----BEGIN CERTIFICATE-----
MIIDMTCCAhmgAwIBAgIBATANBgkqhkiG9w0BAQsFADAfMQwwCgYDVQQKE
wNBQ0wx
DzANBgNVBAMTBlJvb3RDQTAeFw0wMDAxMDEwMDAwMDBaFw0zMDAxMD
EwMDAwMDBa
MB8xDDAKBgNVBAoTA0FDTDEPMA0GA1UEAxMGUm9vdENBMIIBIjANBgkqh
kiG9w0B
AQEFAAOCAQ8AMIIBCgKCAQEA6GK495KUCXAm/UE17G4/cjnZN4LNaxYEYz
bfZL0a
EhgSKYt/LQ+iUcDhojsneusNgrcGkpwKklKsGsvGWmSRNULV01CW+TX2VJN7
3+hh
V0uzhyOIYAUhbDaoqNM6Kp5b7sJ1ew4Ig9kfd/ma9Czl5koESLlw/inLj/r+rD96
- 10 -

CHAPTER1 Overview C455HD | Users & Administrator's Manual
mUcPElWrKspv7Qy4I14fsK/yMArixRopTL1munVVPpSFM9Jh8IY3JHyr5CQJXKK
s
EhGAJsnHaRqsR2Su3X/WtslgEF+cvP34pxhlhFL29nMfnaFATSS3rgGaFlSvl1ZS
esLMqkWjp9cqGYrvt7K61sYnvMMb+o/KbWqVokXb+Fr7bwIDAQABo3gwdjAMB
gNV
HRMEBTADAQH/MB0GA1UdDgQWBBQDXySn9hz15lDraZ+iXddZGReB+zBHB
gNVHSME
QDA+gBQDXySn9hz15lDraZ+iXddZGReB+6EjpCEwHzEMMAoGA1UEChMDQU
NMMQ8w
DQYDVQQDEwZSb290Q0GCAQEwDQYJKoZIhvcNAQELBQADggEBAI0rUywo
mmWWJnH3
JOfKiS3+VnX5hJITZymvWanMXUz/6FonHccPXEBYTrUYwhiWx3dwELAFXDFK
kxMp
0KKWZ4F39cAOLRjqhzya+xUeeJ9HQZCXYAJ6XgvTfN2BtyZk9Ma8WG+H1hNv
vTZY
QLbWsjQdu4eFniEufeYDke1jQ6800LwMlFlc59hMQCeJTenRx4HdJbJV86k1gBU
E
A7fJT1ePrRnXNDRz6QtADWoX3OmN7Meqen/roTwvLpEP22nYwvB28dq3JetlQ
Kwu
XC4gwI/o8K2wo3pySLU9Y/vanxXCr0/en5l3RDz1YpYWmQwHA8jJIu8rxdhr+VNQ
Zv6R/Ys=
-----END CERTIFICATE----
- 11 -

CHAPTER2 Setting up the Phone C455HD | 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.
- 12 -

CHAPTER2 Setting up the Phone C455HD | 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)
- 13 -

CHAPTER2 Setting up the Phone C455HD | 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.
7AC ACkey–forfutureuse–currentlyusedashomekey.
Returnsyoutothehome(idle)screenfromanyscreen.
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.
16
17
▲VOL Increasesordecreasesthevolumeofthehandset,
headset,speaker,ringtoneandcallprogresstones.
▼VOL
- 14 -