Voice and video calls on celluar network disconnect after 3 seconds

### Steps to reproduce

To reproduce
- On iOS, disable WiFi and enable cell data. (On Android, can use either WiFi or cell data, it doesn't matter)
- Make a voice or video call between an Android client to iOS client. It doesn't matter who initiates the call.
- After call connects, talk into either phone until the audio drops. It's easier to see when a video call freezes, but audio works just as well.

### Outcome

#### What did you expect?
Calls should continue working

#### What happened instead?
On Android: audio works for ~3 seconds, then drops. Status shows "Call connecting..." indefinitely. The call is not disconnected
On iOS: audio works for ~3 seconds, then drops. The call is not disconnected, and there is otherwise no sign that something is wrong

### Your phone model

_No response_

### Operating system version

_No response_

### Application version

_No response_

### Homeserver

_No response_

### Will you send logs?

Yes