Voice and video calls on celluar network disconnect after 3 seconds

[mesvam]

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