ER081 Wifi Calling

    I'm getting frequent Wifi calling "Er081"'s on my TMobile Note Edge.  I've tried 3 different ISPs with speeds from 10m-500m, tweaked the QOS and COS on each, multiple wifi's etc.


    It will usually initiate the call.  But it won't be long before call just drops, anywhere from 15-60 mins in.  My calls are always long (>30mins), and I've yet to normally terminate a call.  Of course I'm now getting asked what's going on.


    On one occasion, the ER081 stayed on the drop-down and wouldn't go away until I rebooted phone (Edge).


    IMHO this is a wonderful feature, but TMo is not ready for primetime on this one?  Is it true Note 3's and older phones work fine?  Friend has Note4 with exact issues, makes it unusable

      All replies

      • Re: ER081 Wifi Calling

        After trying all the remedies I could find on-line I finally came up with a real one working with a GREAT T-Mobile support person.

        T-Mobile offers a CellSpot router (TM AC-1900) that will fix the problem.

        I tried it and it did eliminate the problem.

        It is basically a customized Asus RT AC68U.

        The modification essentially gives WiFi calling the highest priority for bandwidth on the router.

        I already had an AC68U and wanted to use it instead.

        If you have an AC68U, N66U, or other router that has a Traffic Manager and/or QoS (Quality of Service) settings, you can do the same thing with your own router.

        Go to your Traffic Manager.

        Turn QoS on.

        Go to User-defined QoS Rules.

        Enter the following two rules giving them a meaningful name like "WiFi Calling", enter the MAC for your phone, enter at least 85% of your available bandwidth (e.g 0-42500 if your maximum transfer rate is 50 Meg), the highest priority and:

        Rule 1: Destination port "4500" Protocol "UDP"

        Rule 2: Destination port "5060, 5061" Protocol "TCP"


        Doing this I went from very repeatable ER081/082 to no problems at all.

        Good luck.

        • magenta4347826

          Re: ER081 Wifi Calling

          Enabling IPSec passthrough fixed this issue for me

          1 of 1 people found this helpful
          • seandex

            Re: ER081 Wifi Calling

            Wi-Fi calling uses IP. Their engineering is of course ready to use and it doesn't get disconnected as long as you make persistence configuration from the router. And these protocols doesn't get bothered much so QoS isn't requiring. However this is very difficult to setup more than regular port forwarding.


            If you are looking for permanent solution without any router configurations and want something works right after plug the cable in, use one of these.



            • moors4093

              Re: ER081 Wifi Calling

              50/50 shot. Works about half the time I am helping friends. Settings -General - System - Reset - Network Settings Reset - Reset Settings. re-enter WiFi password. Simple and effective about half the time.