Public Announcement (Intercom) using the MLML Cisco Phone The Cisco Bogen PA for the main building hallway works as follows: From any MLML Cisco phone using the hand set for speaking, do not use the speaker as it is prone to feedback, dial 14101. Listen for 2 beeps. Dial 00 (zero zero) Listen for announce 'tone' (only played through the speakers in the hall), or you can also wait 2 full seconds. Make your announcement, this is a real-time announcement. Depress the Release ButtonĀ or Handset button to hang-up and avoid making a loud noise. Hang up.