On the IP Office system when you call a user who is on another call, the call recipient sees the caller trying to get through and here's a short ring when the call is initiated. However, the caller has no way of knowing the recipient is on the phone. Is there any way to setup a call waiting beep similar to what you hear when call waiting is activated though the phone company? (that way the caller could hear the break in the ring tone and know you're on another call) Or, setup the system to set your "absent text message" to display "on another call" anytime your first call appearance button is in use?