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Daniel BarnesSep 12, 2025
How to fix 'Duplicate IP' error on AudioCodes C450HD IP Phone?
- KKim ScottSep 12, 2025
If your AudioCodes IP Phone displays 'Duplicate IP', in the DHCP server, delete the duplicate IP address and request another.
How to fix 'Duplicate IP' error on AudioCodes C450HD IP Phone?
If your AudioCodes IP Phone displays 'Duplicate IP', in the DHCP server, delete the duplicate IP address and request another.
What to do if my AudioCodes C450HD IP Phone 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 C450HD 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.
Why does my AudioCodes C450HD IP Phone say 'LAN Link Failure'?
The 'LAN Link Failure' message on your AudioCodes IP Phone indicates there is no LAN connection. Ensure the LAN cable is securely connected to the LAN port on the rear of the phone and that the other end of the cable is connected to the network switch. If it's still not working, contact your network administrator.
Why is displayed on my AudioCodes C450HD?
If you see displayed on the idle screen of your AudioCodes IP Phone, it means the phone can’t connect to Exchange. To fix this, change the username format from audiocodes/someone to someone@audiocodes.com when signing in.
Why is my AudioCodes C450HD IP Phone not ringing?
If your AudioCodes IP Phone is not ringing, the ring volume might be set too low. Increase the volume to resolve this.
How to enable a disabled PIN account on AudioCodes C450HD IP Phone?
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.
Why does my AudioCodes 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 resolve 'PIN not set' on AudioCodes C450HD IP Phone?
If your AudioCodes IP Phone displays 'PIN not set', make sure in the Skype for Business server interface that a PIN was configured for this user account. If it wasn't, create a PIN for the account.
How to fix 'Failed to validate certificate' on AudioCodes C450HD?
If your AudioCodes IP Phone shows 'Failed to validate certificate' or 'Failed to obtain user certificate': * Make sure DHCP Option 43, sub-option 5, was enabled in the DHCP server. If it wasn't, enable it. * Make sure you can access the Skype for Business Web service URL: https://lyncsvrWebPoolFQDN:443/CertProv/CertProvisioningService.svc * Query the LDAP server: _ldap._tcp.. Make sure it was enabled. If it wasn't, enable it in order to get the root certificate.
General| Handset type | Wired handset |
|---|---|
| Product type | IP Phone |
| Product color | Black |
| Wi-Fi | No |
| Ethernet LAN | Yes |
| Security algorithms | 802.1x RADIUS, HTTPS, SRTP, SSL/TLS |
| Networking standards | IEEE 802.1p, IEEE 802.1x |
| Ethernet LAN data rates | 10, 100, 1000 Mbit/s |
| Ethernet LAN interface type | Gigabit Ethernet |
| Supported network protocols | IPv4, TCP, UDP, ICMP, ARP, RTP, SRTP, RTCP-XR, 802.1x, IP/DHCP IP, IEEE 802.1p/Q, QoS/ToS, HTTP/HTTPS/DHCP, NTP, FTP/TFTP, CDP/LLDP VLAN, LDAP |
| Dual-Tone Multi-Frequency (DTMF) modes | SIP info |
| Lines quantity | 8 lines |
| Phonebook capacity | - entries |
| Number of VoIP accounts | - |
| RJ-9 ports quantity | 1 |
| USB 2.0 ports quantity | 2 |
| Certification | FCC 15 B, ICES-003 B, EN55032 B, EN61000-3-2, EN61000-3-3, UL-60950-1, EN60950-1, IEC-60950-1 (CB), CE, cTUVus RCM, KC, Anatel, CCC, ICASA, EAC, IC, ACTA, VCCI, BSMI |
| Volume control | Buttons |
| Number of programmable keys | 8 |
| Storage temperature (T-T) | -20 - 70 °C |
| Operating temperature (T-T) | 0 - 40 °C |
| Display diagonal | 5 \ |
| Display resolution | 1280 x 720 pixels |
| Cables included | LAN (RJ-45) |
| Number of handles included | 1 pc(s) |
| Voice codecs | G.711Mu, G.711a, G.722, G.729A, G.729B, OPUS |
Weight and Dimensions| Depth | 190 mm |
|---|---|
| Width | 234 mm |
| Weight | 1284 g |
| Height (max) | 195 mm |
| Height (min) | 170 mm |
| Package depth | 245 mm |
| Package width | 275 mm |
| Package height | 110 mm |
| Package weight | 1722 g |
Key features of the C450HD model.
Designed for UC environments like Skype for Business.
Ensures all necessary items are present and undamaged.
Familiarizes users with the phone's hardware functions.
Instructions for connecting the phone's cables.
Procedures for mounting the phone on a desk or wall.
Overview of the touch screen interface.
Descriptions of the various softkey functions available.
How to access and navigate through the phone's menus.
Procedures for signing into the phone for service access.
Activating the automatic phone locking mechanism.
Procedures to unlock the phone when it's locked.
Setting the display language for the phone interface.
Choosing a ringtone for incoming calls.
Managing contacts in personal and corporate directories.
Assigning speed dials to function keys.
Setting your availability status for contacts.
Managing handset, speaker, and headset usage.
Procedures for initiating phone calls.
How to accept incoming calls.
Procedures to decline incoming calls.
Handling calls when another is active.
Putting active calls on hold.
Methods for transferring calls to other parties.
Starting group calls.
Configuring BToE for PC integration.
Managing boss and admin phone functionalities.
Resolving power issues.
Resolving network connection problems.
Troubleshooting no incoming call alerts.
Sending logs for technical assistance.
