Nextcloud Talk client keeps ringing if recipient has more than one device

I am experiencing the following issue with the Nextccloud Talk client:

I have the NC Talk client installed on multiple devices, a phone and a tablet. So do several other people. Now if I call one of them, both their devices start ringing, which is what I’d expect. However, if the user then picks up on one of their devices, the other device keeps ringing. This is pretty annoying. If the user then refuses the call on the still ringing device, the call on the device where they’ve already answered the call, also gets terminated.

I would expect that when the user answers the call on one device, all other devices will stop ringing.
Is this a known issue or something that I can correct, perhaps in the settings of the TURN server?

I’d appreciate any hints or tips.