Audio not received in group call in Safari on iOS

[Problem/Question]

I am able to join a voice call successfully in Safari on an iPad, and the microphone appears to be working (i.e. the other client on a Windows PC/Firefox receives the audio from the iPad), but the iPad does not play any audio from the PC. I am using the JavaScript client to connect to the room. A call between two desktop web browsers running the same code works with no issue.

Is there something additional that needs to be done for Safari on iOS to receive and play the audio from the other participant?