On a Comdial system I used to have, if a caller came in and rang your phone, then was forwarded to voicemail, you could press the "Listen" button and hear the vmail as it was being left. You then had a button that, when pressed, would barge in with a stutter tone and allow you to take the call, right then and there.
I always found it a huge convenience and an awesome feature!
I always found it a huge convenience and an awesome feature!

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