Calls not connecting: Element does not handle events of type 'm.call.select_answer'

Describe the bug Calls do not work when receiving or sending.

To Reproduce Steps to reproduce the behavior:

1. Receive call request
2. Accept call request
3. Stuck at: Call connecting…
4. Manually give up on call and hang up
5. Read chat window

Expected behavior Calls connect sending/receiving.

Smartphone (please complete the following information):

• OS: Android 9

Additional context

• 1.0.13 - Google Play Store
• Homeserver: matrix.org

In the chat window this is shown when receiving a call:

Contact placed a voice call.
Contact sent data to setup the call.
Contact sent data to setup the call.
You answered the call.
You sent data to setup the call.
Element does not handle events of type 'm.call.select_answer'
You ended the call.

In the chat window this is shown when sending a call:

You placed a voice call
You sent data to setup the call.
Contact ended the call.
Contact ended the call.

I’m unclear on whether this error occurred because a 3rd party app is now responsible for Android phone calls or if this is relevant but could be worth mentioning. It’s unclear if the problem is only on my end if sending calls doesn’t trigger the Element does not handle events of type 'm.call.select_answer' when sending a call request rather than receiving.

[faaaaabi]

I can also confirm that Desktop<->Desktop and Android<->Android calls work without any problems, but Desktop<->Android calls are not established

[jryans]

As far as I can see, this is because of a Element Web bug (https://github.com/vector-im/element-web/issues/16239) which is now fixed on develop.element.io and will be released momentarily.