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3CX SIP NAT Rules

TCF
Has anybody successfully setup a 3CX SIP behind a Sophos UTM? I either get a huge delay when calling to the Voip numbers or if I change my NAT rules I can remove the delay and then not get an audio and all the Firewall test on the 3CX system fail.

Any help is appreciated.


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  • 0

    Did you ever figure out how to fix this issue?  I have 3CX and am not able to get inbound traffic working.  I can make a call from a handset to an outside number, but the handset never has ring tone and the outside number does ring.  When you answer the outside number I get sound from inside to outside, but outside to inside audio doesn't work.  Our main number states it's not in service.

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  • 0

    Did you ever figure out how to fix this issue?  I have 3CX and am not able to get inbound traffic working.  I can make a call from a handset to an outside number, but the handset never has ring tone and the outside number does ring.  When you answer the outside number I get sound from inside to outside, but outside to inside audio doesn't work.  Our main number states it's not in service.

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  • 0 in reply to RyanMills1

    This thread is kind of old, but I just installed 3CX the other day and ran into the same problem. After some fiddling, I found that the issue was caused by activating VoIP support on the VoIP (Network Protection -> VoIP).

    Hope this will help someone saving some time!

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