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Wifi Calling Verizon not working IAP 225 8.3.0.1

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  • 1.  Wifi Calling Verizon not working IAP 225 8.3.0.1

    Posted Jul 11, 2018 07:35 AM

    WiFi calling for Verizon isn't working when connected to my IAP 225 running 8.3.0.1; however, it will work when connected to a Desktop hotspot connected to the same network. I've taken a few packet caps, 1 at the router showing the failure, and 1 using the desktop hotspot showing a successful connection to wifi calling.

    Desktop AP SuccessDesktop AP SuccessIAP 225 FailingIAP 225 Failing



  • 2.  RE: Wifi Calling Verizon not working IAP 225 8.3.0.1
    Best Answer

    EMPLOYEE
    Posted Jul 11, 2018 10:43 AM

    It looks like possibly an MTU related issue.

     

    From the desktop AP, the SA_INIT starts, there's an initial Initiator Request that is responded to, so a retry with smaller payload. The setup continues with the smaller frame size.

     

    On the AP225, the SA_INIT starts with a response back from Verizon, the client attempts to start with the larger frame size, but never retries with a smaller payload.



  • 3.  RE: Wifi Calling Verizon not working IAP 225 8.3.0.1

    Posted Jul 11, 2018 05:50 PM

    This was the issue. I have jumbo frames set on my router. Dropped the MTU to 1500 on all interfaces and wifi calling is back, even through it worked for 6 months before.