AudioCodes C455HD Series User manual

User's and Administrator's Manual
AudioCodes 400HD IP Phone Series
C455HD IP Phone
Microsoft Teams Application
Version 1.19
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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: January-19-2023
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
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Notice C455HD | Users & Administrator's Manual
Document Name
DeviceManagerDeploymentGuide
https://docs.microsoft.com/en-us/MicrosoftTeams/phones-for-teams

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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 5
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
SSH Access: Reduced File System Privileges 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 34
Connecting to an Available Wi-Fi Network 34
Manually Connecting to a Wi-Fi Network 35
Restoring the Phone to Default Settings 38
Performing a Hard Restore 39
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Content C455HD | Users & Administrator's Manual
Performing a Soft Restore 39
Recovery Mode 40
Locking and Unlocking the Phone 40
Automatic Lock 40
Unlock 40
4 Teams Application 42
Signing In 42
Multi-Cloud Sign-in 46
Remote Provisioning and Sign-in from Teams Admin Center 47
Getting Acquainted with the Phone Screen 51
Enabling Google Talkback 53
Opting in or out of Call Queues 54
Setting Status 54
Hot Desking 55
Changing Presence Status 56
Power Saving 57
Enabling Voicemail Support on CAP Users 58
Configuring Teams Application Settings 59
Setting up a Meeting 62
Using the People Screen 63
Accessing Voicemail 63
Using Audio Devices 64
Transferring Calls and Meetings across Devices 64
Signing Out 64
5 Performing Teams Call Operations 67
Making a Call 67
Microsoft Lightweight Calling Experience 68
Redialing 68
Dialing a Missed Call 68
Select to Dial 68
Making an Emergency Call 68
Answering Calls 70
Ending an Established Call 70
Managing Calls 70
Parking a Call 70
Managing Teams Meetings 71
Using Live Captions 73
Raising a Hand During a Meeting 74
Hiding Names and Meeting Titles for Individual Devices 74
Transferring a Call to Frequent Contacts 74
Transferring a Call to Work Voicemail 74
Viewing and Playing Voicemail Messages 75
Rejecting an Incoming Call, Sending it Directly to Voicemail 75
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Content C455HD | Users & Administrator's Manual
Adjusting Volume 75
Adjusting Ring Volume 76
Adjusting Tones Volume 76
Adjusting Handset Volume 76
Adjusting Speaker Volume 76
Adjusting Headset Volume 76
Playing Incoming Call Ringing through USB Headset 77
Using the Phone as a USB Speaker 77
Viewing and Joining Meetings 77
Better Together over Bluetooth 78
Adding a Speed Dial 81
6 Performing Administrator-Related Operations 84
Setting up Automatic Provisioning 84
Setting up an E911 Emergency Location using TAC 85
Updating Phone Firmware Manually 91
Loading Certificates to Phones 93
AudioCodes Android Phone Utility 93
Certificate Enrollment using SCEP 95
Manually Performing Recovery Operations 97
Removing Devices from Intune Management 98
Configuring Audio-Related Parameters for Noisy Environments 104
Updating Microsoft Teams Devices Remotely 105
Applying Firmware to a Phone from a USB Disk 105
Enabling a Phone to be used as an Audio Device 105
Managing Phones with the Device Manager 106
Configuring a Periodic Provisioning Cycle 107
Configuring TimeZone and Daylight Savings 108
Managing Devices with HTTPS 109
Supported Parameters 109
7 Troubleshooting 111
DSCP 111
Users 112
Network Administrators 113
Android Phone Utility 113
Capturing the Phone & Sidecar Screen 115
Running Tcpdump 116
Getting Information about Phones 117
Remote Logging (Syslog) 119
Getting Diagnostics 120
Getting Logs 122
Activating DSP Recording 123
Deactivating DSP Recording 124
SSH 125
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Content C455HD | Users & Administrator's Manual
Getting the Phone IP Address 125
Installing the APK using SSH 126
Updating Phones using SSH Commands 126
Microsoft Teams Admin Center 127
Collecting Logs 127
Getting Audio Debug Recording Logs 130
Collecting Media Logs (*.blog) from the Phone 131
Capturing Traffic Using 'rpcapd' 131
Port Mirroring Network Monitoring 132
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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hereforvideoblogsandblogsaboutAudioCodes'Teamsphones.
SeehereforvideosandwebinarsaboutAudioCodes'Teamsphones.
SeeheremarketingmaterialrelatedtoallAudioCodes'Teamsphones.
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
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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'AndroidPhoneUtility(seeAndroidPhoneUtilityon
page113)
■LoguploadtoMicrosoftserver(certificationfor3rdpartySkypefor
Businessclients)
■RemoteloggingviaSyslog
■SSHAccess
■Capturingthephonescreen
■TCPdump
■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
anintuitiveuserinterface.
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CHAPTER1 Overview C455HD | Users & Administrator's Manual
Feature Details
■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
✔PowersupplyAC100~240V
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CHAPTER1 Overview C455HD | Users & Administrator's Manual
Feature Details
✔PoEClass3: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
NTP
timeserver
AndroidNTP 123 UDP -
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CHAPTER1 Overview C455HD | Users & Administrator's Manual
Server Role Service Name Port Protocol Notes
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
Android-Level Security Hardening
Major  Android- level  system- level  developments  have  been  incorporated  into  AudioCodes' 
devicestoimprovesecurity:
■SeeGooglePlayServicesonthenextpage
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CHAPTER1 Overview C455HD | Users & Administrator's Manual
■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SSHAccess:ReducedFileSystem
■SeeAndroidSecurityUpdatesonpage9
Google Play Services
GogglePlayserviceswereremovedfromAudioCodesdevicessoftware.AccesstoanyGoogle
storeorPlayserviceisnotallowed.
■UpdatingtheAudioCodes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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 C455HD | Users & Administrator's Manual
Screen Lock
AudioCodes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  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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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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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.
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CHAPTER1 Overview C455HD | Users & Administrator's Manual
■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trustedcertificate:
■Thedeviceisshippedwithknowntrustedcertificateinstalled.SeeAudioCodesRootCA
Certificateonthenextpage.
■Fortheinitialconnection,theAudioCodesDeviceManageraccessesdevicesusingaknown
trustedcertificate.
■Onceasuccessfulsecuredconnectionhasbeenestablishedbetweenthedeviceandthe
DeviceManager,theusercanreplacethetrustedcertificateontheDeviceManagerandon
thephone,andre-establishtheconnectionleveraginganyPrivateTrustedCertificate.
Sandboxing
AudioCodes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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devices,thecertificatekeysareencryptedonthedevicefilesystem.
Device Certificate
AudioCodesdevicesareshippedwithauniquecertificatewhichissignedbyAudioCodesRoot
CA.Networkadministratorscaninstallathird-partycertificateonthephoneinthecustomer’s
trusted  environment.  Network  administrators  should  follow  the  following  guidelines  when 
replacingtheexistingdevicecertificate:
■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
●security/device_private_key_url=http://<server-ip>/device.key
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CHAPTER1 Overview C455HD | Users & Administrator's Manual
Trusted certificates are provisioned by parameter security/ca_certificate/[0-4]/
Data Protection
AudioCodesdevicesrunAndroidwhichhasintegralproceduresforprotectingandsecuringuser
data.
Debugging Interface
■AudioCodes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).
SSH Access: Reduced File System Privileges
AdministratoruserswhoaccessSSHhavereducedfilesystemprivileges.Forexample,filescan-
notbedeleted,andsomepartsofthefilesystemcannotbereviewed.Thispreventsmalicious
actionsorunintendederrorsthatmightcausedamagetothedevice.
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 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
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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----
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CHAPTER2 Setting up the Phone C455HD | Users & Administrator's Manual
2 Setting up the Phone
Theinstructionsfollowingshowhowtoset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 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)
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