Call waiting notification for secondary call on Mobile
Currently there is not an option within the app to have an audible notification if a second call is coming in. It will only display a banner which most people who are using there phone will not see.
Simon Jackson commented
+1 - only for "Queued" calls.
EG Helpdesk staff set their status to busy (lets say they are in a Teams Meeting); but they are missing queued calls. Having a notification would allow one of them to drop out of the meeting and accept the inbound call.