AT&T 4-LINE INTERCOM SPEAKER WORKS WITH ATT964, EXPANDABLE UP TO 12 STATIONS 

AT&T 4-Line Intercom Speaker works with ATT964, expandable up to 12 stations	Product Code: ATT955 Price: Check Latest 90889 4-Line Intercom Speaker. Four-line speakerphone with intercom works with the integrated phone ATT964, expandable up to 12 stations, Caller ID with 99# call log, 99# directory, 2 data ports, individual station paging or system-wide, headset jack. Black.