Solved Fanvil X6U SIP Registration Failed

[BGPrescott]

Good day,

New 3CX system. 3 Phones are working, 3 are not. All of the phones are Fanvil X6U. 3 work properly and 3 do not.

On the non working phones, I have rebooted. I have factory reset each of the 3 non working phones and then reapplied the settings, yet I continually get SIP Register Fail.
Incoming calls work on all Phones, but outbound calling does not work on the non registered phones.

My Server / Setup Info:

• 3CX Version, Standard 18.0 Update 3 (Build 461)Version
• Is the 3CX Server Hosted and where? Hosted by 3CX
• IP Phone Make/Model/Firmware version, e.g. Fanvil X6U version 2.4.12

• Provisioning Method: STUN

• Trunk Provider VITELITY
• Has the Firewall Checker passed: YES
• Are custom Phone Templates being used: NO

I am unsure as to why 3 work and 3 do not.

Suggestions?

 

[BGPrescott]

Hello,

The problem was resolved. The problem was caused by the SonicWALL SIP Transformation option was turned on (Thanks to another VoIP Provider who turned it on).

Once I turned it off, the phones worked properly.

I hope this may help someone in the future.

 

[Saqqara]

Hope you have configure the phones the 3cx supported way

with that amount of phones at the same location. I suggest you install a sbc server instead of using stun - it will save you a lot of hassle in the future https://www.3cx.com/docs/3cx-tunnel-session-border-controller/

 

[BGPrescott]

Saqqara,

Thank you for the response. As I mentioned in my response, the problem was with the SonicWALL router configuration. But your link and recommendations are appreciated.

Yes, a SBC is going in tomorrow.