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  1. Can't establish Trunk

    Check your router to make sure that Port forwarding is correct if that doesn't work then this seems to be a similar thread https://www.3cx.com/community/threads/firewall-check-v15-issue.46425/

  2. 3CX v15 SBC

    Maybe you could update http://www.3cx.com/docs/3cx-tunnel-session-border-controller/ and http://www.3cx.com/docs/3cx-sbc-windows/ to advise. However, you are talking about £800 minimum for the hardware and a Windows license for each SBC.

  3. 3CX v15 SBC

    3CX is hosted externally, its not connected via VPN. Can you explain why it should not work? I'm sure SBC does not use any of the ports or relies on any of the services.

  4. Can't establish Trunk

    Suggests its not DNS. Run the firewall test to make sure that is not the cause. We used to have issues like this with out v12.5 system, sometimes a reboot of the server (not restarting the services) would help, other times changing the public IP from specified to via stun would do the trick.

  5. 3CX v15 SBC

    Hi I have a remotely hosted 3CX (3CX Phone System Standard SPLA, 15.0.0) and have two SBC's (3CXSBC15.0.61335) in two offices. The two offices are VPN'd at the router level and the servers that run the SBC's are physical but have a number of other roles such as DNS, DHCP and VPN. SIP ALG has...

  6. Can't establish Trunk

    ping the host name, try using the IP address?
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