SIP-Phone Passthrough OpenVPN - Call Is Drop After Few Seconds



  • My problem could be related to NAT and OpenVPN.

    My pfSense Config (pfSense 2..1.4):
    OpenVPN server configured with tunnel - 10.0.1.0/24
    OpenVPN client tunnel - 10.0.1.201
    LAN Subnet is - 192.168.1.0/24
    Client Machine - 192.168.1.201
    SIP-Phone on Client Machine - 192.168.1.201
    Elastix PBX - 192.168.1.240 | not an OpenVPN client yet
    SIP-Phone - Zoiper
    Client Machine OS - Linuxmint 17 64bit

    Network Setup

    Client Machine and Softphone (OpenVPN client with 10.0.1.201 tunnel IP) = machine –- pfsense --- gateway
    Elastix PBX = machine --- pfsense -- gateway

    The Problem:

    Trying to make an outbound call, first I tried dialing *60 to call the PBX clock, it works fine when client machine is not connected to the VPN. But when connected to the VPN, call is drop after 6-7 seconds.



  • Might need to use static ports on your asterisk box. Chane to manual nat then create a rule for your pbx to use static ports. Also on your remote end make sure your router is not using ALG. (Application Level Gateway)


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