Ability to Silence the Beep Letting You Know there is another call incoming

When taking back to back calls on weekends, we need the ability to turn off the beep for incoming calls. We are unable to hear the client on their end when the beep happens and have to ask them to repeat themselves. If multiple back to back calls come in, it happens too much and clients get upset that we cannot hear them. There needs to be another method of notifying us that there is another call incoming, like vibrating the cell phone or making the flashlight flash.