SIP Trunk Setup for Cisco 8841
Setting up your device with Voyced as your Business VoIP Provider.
What You’ll Need
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Cisco 8841 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 Applications
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Select Admin Settings > Reset Settings > All Settings
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Confirm and allow the phone to reboot
Requirements Before You Begin
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Connect the phone to power and the network
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Find its IP address: Applications > Status > Network Status > IPv4
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Open the IP in your browser
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Login:
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Username: admin
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Password: (default or as set)
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Security Tip:
Change the admin password under Device Administration > User Management
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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User ID: Your-Voyced-DID
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Authentication Name: Your-Voyced-DID
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Authentication Password: YourServicePassword
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SIP Server 1 Address: sip.voyced.eu
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Port: 5060
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Transport Protocol: UDP
If DNS NAPTR or SRV is not supported:
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SIP Server 2 Address: sipnl.voyced.eu
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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 Voice > SIP > Codec Preferences.
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 and port 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
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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 (voicemail or menu)
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Caller ID is correct
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Final Tips
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Never expose the 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.
