SIP Trunk Setup for Polycom VVX 450
Setting up your device with Voyced as your Business VoIP Provider.
What You’ll Need
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Polycom VVX 450 IP phone
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Internet connection
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Power adapter or PoE switch
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Web browser on the same network
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Voyced SIP account details:
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Your-Voyced-DID (username)
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YourServicePassword (password)
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SIP server: sip.voyced.eu
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Reset the Phone (Optional)
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Press Home > Settings > Advanced
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Default admin password: 456
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Select Administration Settings > Reset to Defaults > Reset to Factory
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Confirm and wait for reboot
Requirements Before You Begin
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Connect the phone to the network and power
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Find its IP address: Home > Settings > Status > Platform > Phone > IP
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Open the IP address in your browser
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Login:
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Username: admin
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Password: 456
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Security Tip:
Change the admin password under Settings > Advanced > Administration Settings > Change Password
SIP Trunk Setup Steps
Only change the settings below. Leave all others as they are.
1. SIP Line Registration (Line 1)
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Display Name: Voyced
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Address: Your-Voyced-DID
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Authentication User ID: Your-Voyced-DID
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Authentication Password: YourServicePassword
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Label: Voyced
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SIP Server Address: sip.voyced.eu
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SIP Server Port: 5060
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Transport Protocol: UDP
If DNS NAPTR or SRV is not supported:
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Secondary Server Address: sipnl.voyced.eu
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Secondary Server Port: 5060
2. Basic Settings
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Voice Mail Number: 1233
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Subscribe to Voice Mail: ✅
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DTMF Type: RFC2833
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Enable Fallback: ✅
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Fallback Interval: 1800
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Use STUN: ❌ Disabled
3. Codec Settings
Go to Settings > Codec Priorities.
List in this priority order (from higher quality to lower):
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G722 **
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G723 **
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G726 **
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PCMU (u-law)
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PCMA (a-law)
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G711
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G729
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Opus **
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iLBC **
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AMR-WB **
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AMR **
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GSM
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Any other codecs your device supports
Codecs marked with ** may be supported but aren't guaranteed to work across all global routes.
If you have audio issues, switch back to G711 or G729 and test again.
4. Advanced Settings
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Keep Alive Type: UDP
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Keep Alive Interval: 30
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Enable Rport: ✅
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DNS Mode: SRV (fallback to host if SRV not supported)
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SIP Version: RFC3261
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Local SIP Port: 5060
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Enable Strict Proxy: ✅
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Caller ID Header: PAI-RPID-F
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Transaction Timers (T1/T2/T4): 500 / 4000 / 5000
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RTP Encryption (SRTP): Disabled
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Unregister on Reboot: ❌
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Registration Failure Retry Time: 32 seconds
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Strict UA Match: ✅
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Enable RFC4475: ✅
Save and Finalise
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Click Save or Apply
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Disable unused lines by setting them to inactive
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Reboot the phone if prompted
Testing Your Setup
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Call Your-Voyced-DID from another phone
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Make an outbound call
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Confirm:
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Audio is clear both ways
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DTMF works in menus or voicemail
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Caller ID is correct
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Final Tips
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Never expose the phone’s web interface to the internet
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Always use UDP
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Disable STUN and proxy
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DNS order: NAPTR → SRV → host fallback
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Keep firmware updated
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Use VLAN or reserved IP if supported
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Voyced SIP accounts do not guarantee emergency call routing
Last updated: 01/08/2025
© Voyced
All information provided is copyrighted and purely informative in nature. It is maintained by Voyced with the greatest of care using reliable sources only.
Given the fast evolution of the telecom sector, Voyced does not offer any guarantee about the accuracy and completeness of the information offered.
We explicitly do not give anyone permission to use this information in any other way than to inform themselves about what (legal) requirements there may be and they need to comply with when registering Services and/or DIDs with Voyced.
