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3CX PBX does not ACK 200

Discussion in '3CX Phone System - General' started by pheitkemper, Jan 9, 2012.

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  1. pheitkemper

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    We have implemented a service which registers as an extension to 3CX. I have sucessfully called to this service from various softphones and a Cisco 504G. It works great.

    The problem comes when I try to use a Grandstream 4104 on our house PBX to call this service. When I call from the analog side, the invite occurs. My service sends a 100Trying, 180 Ringing, and 200 OK messages. However, does not ACK my 200, and 3CX continues to send me invite requests. These occur with the time-doubling you would expect if the PBX has not received the 200 msg. Using Wireshark, I can see that the machine always receives these packets.

    The other interesting aspect comes when I replace my service with a soft phone (3CXPhone, Phonerlite) configured for the same extension. The call works perfectly. This also occurs when I change the forwarding rules to forward to another extension, be it softphone or the Cisco 504G mentioned before.

    Why would my service work perfectly with 3CX and a softphone, but not with 3CX and a Grandstream? That would suggest a configuration error on the Grandstream. But I can make calls to anything else besides my service.

    This is repeatable behavior. I have also had the same results using a Patton 4114 Smartnode. Also, I have used this service before with this PBX and Grandstream device (and our house analog PBX for that matter).

    Please help me understand what's happening. How do I go about debugging this?

    Thanks,
    Paul
     
  2. danhriscanu

    danhriscanu New Member

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    Hi,

    Please see http: //www.3cx.com/voip-gateways/Grandstream-GXW-41044108 - NO LONGER AVAILABLE
     
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  3. pheitkemper

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    I used this to set up the gateway in the first place. What am I missing?
     
  4. danhriscanu

    danhriscanu New Member

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    Did you also try to activate "PBX Delivers Audio" in Advance tab of Grandstream device?
     
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  5. SY

    SY Well-Known Member
    3CX Support

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    It looks like that the response 200 OK, which is replied by your service, is malformed in this call scenario...
     
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