Here is my scenario. I have a Sonicwall with LAN 192.168.16.x with a VLAN(VOIP)of 10.10.20.X The PBX has a 192.168.16.X IP

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The ISP just installed a ESBC on the network and I gave it a 192.168.16.x IP. I was told that the PBX had to use the ESBC as its gateway, however by doing that the VLAN or IP phones are unable to see the PBX.

What would be the best way to handle this?

  • Please provide a simple diagram of your network, and the model of you ESBC.
    – Ron Trunk
    Mar 8, 2019 at 13:41
  • I assume I can attach something. Mar 8, 2019 at 14:30
  • You can edit your question to include an image.
    – Ron Trunk
    Mar 8, 2019 at 14:32

1 Answer 1


The Gateway for the PBX should be the firewall ( But you need to add a route (default) to the PBX to send SIP traffic to the SBC.

  • Thank you Ron. That is what it was originally. I will try that and see what happens. Mar 8, 2019 at 15:50
  • I created a route from the PBX to the SBC for VOIP services and that seemed to solve the problem. Thanks Ron. Mar 8, 2019 at 16:35

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