AIR FORCE. T.O.10M1-7-9-1-1 ARMY TM 11-5895-1021-14/1 MARINE CORPS TM 08045-15/1 party answers, press the TALK switch to talk and release it to listen.  In some II Segment deployments, it is possible to have more than 16 intercom stations.  Therefore, each station is provided direct access to only certain selected station. To call any station not included in the directory from a given station, the caller must call his A-Shelter supervisor who can patch  him  to  the  desired  station  by  pressing  the  button  for  that  station.    In  some  instances,  such  as  when  an  I-Shelter station is calling an I-Shelter station outside its network, the caller’s supervisor must patch to the called party’s supervisor, who must complete the patch.  In all cases where intermediate stations are used for patching, the patching stations must leave their handsets off the hook.  Hanging up will release all pushbuttons and break the patch.  Table 3-1 is a complete Intercom  directory  for  the  maximum  possible  number  of  intercom  stations.    Figure  3-1  is  a  diagram  of  this  maximum hookup.  Refer to the intercom set manual T 0  31S1-4-221-1 for complete details on the intercom set. Table 3-1.  Intercom Directory Shelter ID Code AS100 Calling Station ID Code AS101 Calling Station ID Code AS102 Destination Station Pushbutton Destination Station Pushbutton ID Code Number ID Code Number IS111 1 IS111 1 IS112 2 IS112 2 IS121 3 IS121 3 IS122 4 IS122 4 IS131 5 IS131 5 IS132 6 IS132 6 IS211 7 IS211 7 IS212 8 IS212 8 IS221 9 IS221 9 IS222 10 IS222 10 IS231 11 IS231 11 IS232 12 IS232 12 AS102 13 AS101 13 AS201 14 AS202 14 AS301 15 AS302 15 AS401 16 AS402 16 Change 1  3-2