OnePlus 8-5G Wifi Calling has no sound

hey there,

an option that is usually enabled by default on my most home routers is something called

SIP ALG

the location of this feature will vary according to which router you got but you wanna make sure this is disabled.

hopefully this will vastly improve your situation.  troubleshooting VoIP issues can be extremely difficult to isolate (hence t-mobile giving eryone the run around) but issues of one way audio, no audio and dropped calls can usually be blamed because SIP ALG está activado.

g’luck and happy new year!

Update - I’ve also tried replacing the SIM and toggling call mute/hold.

I contacted OnePlus and they first told me the problem was "already solved" and that I needed to contact TMobile for the fix (which, when I asked what it was, they said "The latest OTA update" which I already have). So no help there.

So far, the only thing that has worked for me, is to reboot the phone once I'm connected to the new WiFi network. But this doesn't last- If I do this first thing in the morning, by afternoon I have to reboot again. SMS Text messages do not seem to work over wifi at all (send/receive) on this device.

Lots of WiFi Calling problems here on the LG Thinq G8 since last summer.  The Wi-Fi pop ups kept happening so much I had to disable the always on display.  Lately I've had more friends complain it takes 30-60 seconds to connect a call to me.  Getting really fed up, my Samsung S7 never had any problems like this. I'm about to disable the WiFi calling all together (which was a major feature that kept me on Tmobile).

Maybe helpful, maybe not.  I have noticed that when my phone is on standby when pinging the WiFi IP address from a desktop on the same network I will get consistent crazy responses in the 200s and 300s.  If I wake the phone up and start to use it, those pings go to a normal 2-5ms range.  I was going to start looking in to a WiFi keep-awake app to try to prevent those high pings.

I have the exact same issue with my Samsung Galaxy Flip Z 5G. When making or receiving calls with Wifi Calling enabled, I sometimes get no audio from the earpiece. Only a hard reboot seems to fix the issue (or disabling Wifi Calling). I'm running Android 11, build # ends in CUC6. I've had this issue for at least all of 2021 and possibly since I got the phone in Fall 2020.

Same issue here. OnePlus 8T5G running Android 11 as of April 2021. Not sure if this date coincides with when this issue began because I don't make voice calls often but definitely over the last month or so as I've been using voice calls more, so there could be a link there. I want to say this happens more than half the time. Usually I'll hear a ring tone but then when the person picks up I hear silence. I can confirm afterwards that the other person could hear me but I could not hear them. Have disabled Wi-Fi calling for now so let's see how it goes.

While I haven't had this issue with my OP 8, I've filed tickets with OnePlus for others, and OP is not very helpful

Wifi calling hasn't worked on TMobile since before the latest update. I've had to turn off wifi calling on my last two devices. This is still an issue, but I don't think posting here makes a difference, because TMO isn't reading these posts. 

I have three OnePlus devices, an 8T, Nord and 6T. All three have the same problem, where callers cannot hear anything. In every case, turning off wifi calling fixes the issue. How is it possible this issue persists after being reported for months? If wifi calling doesn't work, or can't work, then just disable the feature! Problem is it seems to turn back on during some reboots or updates and you don't realize until you experience the problem again. It is the height of annoyance when your phone doesn't work as a phone.

Same problem here with the OnePlus Nord N10 5G, purchased two weeks ago. With wi-fi calling on, I can not hear callers. With wi-fi calling off, calls are fine. 

Very disappointing since I was hoping to use this device on an upcoming international trip. I would have preferred voice calls at $.00 a minute over wi-fi vs. having to pay $.20 a minute. 

I'm having the same problem on my OnePlus Pro 9 5G. Just started about a week ago in mid-August 2021.