When on a call and a second call comes in you lose all sound of the original call. the phone just goes dead.
From the second callers end you get an interrupted tone but nothing else. I am not sure if it would go to voicemail have to test that.
There is little in manual about this other than you should press the R button which presumably will transfer you to the new incoming call. Have not tried this but interested in getting others feedback on call waiting.
Its all very well pressing the R button if you knew a call was there but as the call just disappears how the heck are you supposed to know there is a call coming in. Meanwhile the other end of the first call just ends up with nothing.
Interesting if you abandon the second call you get the first party back again if they haven't hung up in frustration
Surely it should allow you to continue your call and put a discreet tome on call to warn you of a second call coming in. Then you can choose to answer or not