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Jordan PattersonSep 23, 2025
How to fix poor touch screen display on AudioCodes IP Phone?
- PPeggy WardSep 23, 2025
If the touch screen display on your AudioCodes IP Phone is poor, adjust the phone’s screen brightness.
How to fix poor touch screen display on AudioCodes IP Phone?
If the touch screen display on your AudioCodes IP Phone is poor, adjust the phone’s screen brightness.
What to do if AudioCodes 450HD IP Phone shows 'Failed to validate certificate' or 'Failed to obtain user certificate'?
If your AudioCodes IP Phone displays a certificate error, first ensure that DHCP Option 43, sub-option 5, is enabled on your DHCP server. Also, verify you can access the Skype for Business Web service URL: https://lyncsvrWebPoolFQDN:443/CertProv/CertProvisioningService.svc. Finally, check that querying the LDAP server (_ldap._tcp.) is enabled to obtain the root certificate.
What to do if AudioCodes 450HD shows 'PIN invalid phone info'?
If your AudioCodes IP Phone displays this notification, ensure the information entered on the phone screen and in the Skype for Business server interface is correct and matches. Also, verify in the Skype for Business server interface that the PIN is enabled; if not, enable it.
How to fix 'Cannot find SIP server' error on AudioCodes 450HD IP Phone?
If your AudioCodes IP Phone can't find the SIP server, make sure at least one of the following is enabled in the DNS server: _sipinternaltls._tcp. (for TLS), DHCP results (Option 120) (for TLS), _sipinternal._tcp. (for TCP), DHCP results (Option 120) (for TCP), _sip._tls. (for TLS), or _sip._tcp. (for TCP).
What to do if AudioCodes 450HD IP Phone shows 'Calendar is not available for PIN code login'?
If your AudioCodes IP Phone displays the message 'Calendar is not available for PIN code login', it means the phone cannot access Microsoft Exchange Calendar. Log in again but do not log in using PIN code. Log in using Username and Password.
What to do if AudioCodes 450HD IP Phone says 'PIN expired'?
If your AudioCodes IP Phone displays 'PIN expired', renew the PIN expiration policy in the Skype for Business server interface.
Why does my AudioCodes 450HD IP Phone say 'Location look-up failed'?
If your AudioCodes IP Phone displays 'Location look-up failed. Please enter your address', make sure 'Location look up' is configured by the management shell in the Skype for Business server.
How to troubleshoot 'PIN internal error' on AudioCodes IP Phone?
To troubleshoot a 'PIN internal error' message on your AudioCodes IP Phone: * Test the PIN Authentication process on the Skype for Business server by running the emulate cmdlet in the server shell: Test-CsPhoneBootstrap -PhoneOrExt nnnn -PIN nnnn. * If the test result is 'fail', there's a configuration error on the Skype for Business server side, hence the PIN sign-in failure on the phone side.
What to do if AudioCodes IP Phone fails to connect to time server?
If your AudioCodes IP Phone displays 'Failed to connect to time server' or 'PIN internal error', ensure that at least one of the following is configured to enable synchronization: NTP server via DNS SRV record (_ntp._udp. pointing to NTP server), NTP server returned via DHCP Option 42, Time.windows.com, Time.nist.gov, or a manually configured Configuration Parameter.
What to do if AudioCodes 450HD shows 'Location look-up failed'?
If your AudioCodes IP Phone displays 'Location look-up failed', ensure that 'Location look up' is configured by the management shell in the Skype for Business server.
General| Resolution | 480 x 272 pixels |
|---|---|
| Audio Quality | HD voice |
| SIP Accounts | Up to 6 |
| Speakerphone | Full-duplex |
| Supported Languages | Multiple languages |
| Number of Lines | 6 |
| Display | 4.3 inch color LCD |
| Ethernet Ports | 2 (10/100/1000 Mbps) |
| USB Ports | 1 (USB 2.0) |
| Headset Connection | 3.5mm jack |
| PoE | Yes (802.3af) |
| Codecs | G.711, G.722, G.729, Opus |
| Protocols Supported | SIP, RTP |
| Bluetooth | Optional via USB |
Highlights of the 450HD IP Phone, including touch screen and UC capabilities.
How the phone integrates with UC environments like Skype for Business.
Contents of the package and identification of phone components.
Steps for connecting the phone's cables for power and network.
Procedures for mounting the phone on a desk or wall.
Understanding the phone's touch screen interface and idle state display.
Explains softkeys and how to navigate through phone menus.
Procedures for entering numbers, letters, and symbols using the keypad.
Steps for signing into and out of the phone for user access.
Configuring language, ring tones, call waiting, and call forwarding.
Adjusting phone volume and screen brightness for user preference.
Managing personal and corporate directories, adding, searching, and editing contacts.
Customizing function keys for speed dial, BLF, and key events.
Managing presence status and viewing calendar integration.
Core functions of making, answering, ending, and rejecting calls.
Reviewing call logs and managing voicemail messages.
Managing waiting calls, call hold, and multiple incoming calls.
Performing various call transfer types and setting up conferences.
Setting up and using Better Together over Ethernet for PC/phone integration.
Using BToE functions for enhanced Skype for Business client features.
Guidance for resolving typical phone operational problems.
