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Thread: Remote Extension dialing out using WAN NAT IP rather than approved carrier?

  1. #1

    Cool Remote Extension dialing out using WAN NAT IP rather than approved carrier?

    We have a quadro 2x this is behind a Verizon router which we have DMZ for the test.
    The quadro's WAN is on an internal IP 10.0.1.0/24. It's LAN IP address scheme is 192.168.1.0/24

    The quadro 2x has SIP trunks registered successfully with our upstream carrier and is successfully completing inbound and outbound calling with two way audio on 3 local SNOM IP320s that are on the LAN side (192.168.1.0/24) of the Epygi.

    We have a remote extension that is registering successfully by registering using the WAN public IP that is on the DMZ and forwarding to the WAN internal ip of the Epygi.

    When we call the remote utilizing extensions, it rings.
    When we call from the remote extension I get "number does not exist msg from Epygi.
    When I browse to the call statistics, "unsuccessful" reports that the remote is dialing "number@WANinternalIPofEpygi" rather than my SIP carrier?

    I can't dial 00, an extension, or a public telephone number without the above error.

    Thoughts?

    Thanks for the reply!
    Shawn

  2. #2

    Default

    Here is a record of the unseccessful calls at first from the remote versus the successful calls from the internal extensions
    71.##.##.## is the NATed public IP address of the Epyi

    Here is my Call statistics:

    Call Start Time Calling Phone Called Phone Call Detail
    23-Apr-2012 11:52:12 "Shawn Ring" 110 8888172233@71.##.##.##:5060 "User Not Found"
    23-Apr-2012 11:50:30 "Shawn Ring" 110 00@71.##.##.##:5060 "User Not Found"

    A typical record should look like:

    Call Start Time Calling Phone Called Phone Call Detail
    23-Apr-2012 11:52:12 "Shawn Ring" 110 8888172233@sipcarrierip:5060 "Codec: PCMU, Quality: 2 (good)"
    23-Apr-2012 11:50:30 "Shawn Ring" 110 "Attendant" 00 "Codec: PCMU, Quality: 1 (excellent)

    It appears my PBX is routing my external extension through it's public IP?
    Thanks
    Shawn

  3. #3
    Senior Member
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    HORNSBY, NSW, Australia
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    Default

    Hi Shawn,
    Thanks for your detailed problem description, it really helps.

    Is the remote extension phone behind a NAT router?

    If so, you'll have to configure the remote extension phone for the Internet IP address of the NAT router, or use STUN.

    What is the remote extension phone model and firmware version?
    Armed with that information can tell you the exact parameter to configure.

    I prefer to hardcode the Internet IP address of the NAT router and not use STUN as STUN is another server somewhere that is a point of failure

    If the remote extension phone is dynamic IP, you'll have to use STUN.

    Likewise, at the Quadro 2x end, I force the NAT traversal settings rather than use the Epygi STUN server.

    The above can be adjusted via menu:
    Telephony/NAT Traversal Settings

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