Voicemail: "Let caller record a message or be transferred to someone else" confusing behavior
It is possible to configure your voicemail so a caller can press zero to be transferred to a different number. Your greeting could say "For immediate assistance, press zero." I have discovered that if someone calls from an outside line, gets voicemail and then presses zero prior to being prompted, the outgoing greeting keeps playing while the call is ringing the target. This means you hear "Please leave a message after the beep... Press zero to be transferred" while you also hear the target ringing. This is very confusing.