While on an active call, you can receive and answer a second incoming call.
While on an active call on Avaya Vantage™ built-in UC experience, if you accept an incoming Avaya Spaces call, the call on Avaya Vantage™ built-in UC experience is put on hold. Inversely, during an Avaya Spaces call, if you accept a call on Avaya Vantage™ built-in UC experience, the Avaya Spaces call gets disconnected.