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Amber McgrathSep 5, 2025
What to do if AudioCodes IP Phone says 'PIN expired'?
- Bbill35Sep 5, 2025
If your AudioCodes IP Phone displays 'PIN expired', renew the PIN expiration policy in the Skype for Business server interface.
What to do if AudioCodes 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.
How to improve poor LCD display on AudioCodes IP Phone?
If the LCD display on your AudioCodes IP Phone is poor, try adjusting the phone’s screen contrast level and the screen’s backlight timeout.
What to do if my AudioCodes 400HD is off?
If your AudioCodes IP Phone isn't turning on, start by ensuring the AC/DC power adapter is firmly connected to the DC input on the phone's rear and plugged into a functional electrical outlet. If you're using Power over Ethernet (PoE), contact your network administrator to verify the switch is providing power to the phone.
Why does my AudioCodes IP Phone headset have no audio?
If you're not getting any sound through your AudioCodes IP Phone headset, first ensure it's securely plugged into the headset port on the phone's side. Also, check that the headset volume is set to an audible level.
What to do if AudioCodes 400HD 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.
Why does my AudioCodes 400HD IP Phone say 'Failed to connect server'?
If your AudioCodes IP Phone displays 'Failed to connect server' or 'Cannot find Lync server at ', ensure that 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), _sip._tcp. (for TCP).
Why does my AudioCodes 400HD say 'Registration…' and I can't make calls?
If your AudioCodes IP Phone displays a 'Registration…' message and you cannot make or receive calls, it means that the line is not registered to the network. If your phone has multiple lines and an 'X' is displayed in the LCD for a line, this indicates that the line has not been successfully registered. Contact your system administrator for assistance.
How to enable a disabled PIN account on AudioCodes 400HD?
If your AudioCodes IP Phone displays 'PIN account disabled', make sure in the Skype for Business server interface that the account was enabled. If it wasn't, enable it.
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.
How to fix 'Duplicate IP' error on AudioCodes 400HD IP Phone?
If your AudioCodes IP Phone displays 'Duplicate IP', in the DHCP server, delete the duplicate IP address and request another.
General| Type | IP Phone |
|---|---|
| Audio Quality | HD Voice |
| Ethernet Ports | 2 |
| Display | Graphical LCD |
| Display Size | 2.8 inches |
| Connectivity | Ethernet |
| Power over Ethernet | Yes |
| Headset Port | Yes (3.5mm) |
| Supported Codecs | G.711, G.722, G.729, iLBC, Opus |
| Supported Protocols | SIP, RTP, RTCP, HTTP, HTTPS, TFTP, DNS, DHCP, TLS, SRTP |
