Routing SIP traffic over OpenVPN using different gateways



  • I am unable to route SIP audio over a point-to-point OpenVPN connection between home and work. The home network is on its own subnet (10.71.73.0/24). The work network is on a different subnet (10.0.0.0/8). Most internet traffic passes beautifully over the VPN. SIP calls do not.

    Calls from work (10.0.0.0/8, where the PBX server is) to home (10.71.73.0/24) ring the phone but do not include audio.

    Calls from home (10.71.73.0/24) will not establish (the phone gateway reports no connection).

    This link is the closest I found to my situation. I generally understand my troubles may be because I am spanning two gateways. I do not understand how to fix the problem.

    My home subnet (10.71.73.0/24) is easily changed. I cannot modify my work subnet. I do have essentially full control over both VPN endpoint configurations.



  • Hi

    Just checking if you found the solution to the SIP configuration, Also, what client are you using for smart phones?


  • LAYER 8 Netgate

    Your problem is probably that 10.0.0.0/8 and 10.71.73.0/24 are conflicting networks.

    Nothing special needs to be done to SIP over OpenVPN.  There's usually no NAT so it's easy.


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