/* * FSM pseudo code used in the design/implementation of the CC Q.SIG agent. */ FSM CC_QSIG_Agent { State CC_STATE_IDLE { Init { } Prolog { Action Set_Selfdestruct; } Stimulus CC_EVENT_AVAILABLE { Next_State CC_STATE_AVAILABLE; } Stimulus CC_EVENT_CANCEL { Action Set_Selfdestruct; } } State CC_STATE_AVAILABLE { /* * For Q.SIG mode the T_RETENTION timer is not defined. However, * we will use it anyway in this state to protect our resources * from leaks caused by user A not requesting CC. This timer * should be set much longer than the PTMP network link to * allow for variations in user A's CC offer timer. */ Epilog { Action Stop_T_RETENTION; } Stimulus CC_EVENT_MSG_RELEASE { Action Stop_T_RETENTION; Action Start_T_RETENTION; } Stimulus CC_EVENT_MSG_RELEASE_COMPLETE { Action Stop_T_RETENTION; Action Start_T_RETENTION; } Stimulus CC_EVENT_CC_REQUEST { Action Pass_Up_CC_Request; /* Send Q931_CALL_PROCEEDING message on signaling link. */ Action Send_Call_Proceeding; Next_State CC_STATE_REQUESTED; } Stimulus CC_EVENT_INTERNAL_CLEARING { Action Stop_T_RETENTION; Action Start_T_RETENTION; } Stimulus CC_EVENT_TIMEOUT_T_RETENTION { Action Pass_Up_CC_Cancel; Next_State CC_STATE_IDLE; } Stimulus CC_EVENT_CANCEL { Next_State CC_STATE_IDLE; } } State CC_STATE_REQUESTED { Stimulus CC_EVENT_CC_REQUEST_ACCEPT { Next_State CC_STATE_ACTIVATED; } Stimulus CC_EVENT_SIGNALING_GONE { /* Signaling link cleared. */ Action Pass_Up_CC_Cancel; Next_State CC_STATE_IDLE; } Stimulus CC_EVENT_CANCEL { Action Hangup_Signaling_Link; Next_State CC_STATE_IDLE; } } State CC_STATE_WAIT_DESTRUCTION { /* * Delayed disconnect of the signaling link to allow subcmd events * from the signaling link to be passed up. */ Stimulus CC_EVENT_SIGNALING_GONE { /* Signaling link cleared. */ Next_State CC_STATE_IDLE; } Stimulus CC_EVENT_HANGUP_SIGNALING { Action Hangup_Signaling_Link; Next_State CC_STATE_IDLE; } } State CC_STATE_ACTIVATED { Stimulus CC_EVENT_REMOTE_USER_FREE { /* Send ccExecPossible in FACILITY or SETUP. */ Action Send_RemoteUserFree; Next_State CC_STATE_WAIT_CALLBACK; } } State CC_STATE_WAIT_CALLBACK { Stimulus CC_EVENT_SUSPEND { /* Received ccSuspend */ Action Set_A_Status_Busy; Action Pass_Up_A_Status; Next_State CC_STATE_SUSPENDED; } Stimulus CC_EVENT_RECALL { /* Received ccRingout */ Action Pass_Up_CC_Call; Action Set_Original_Call_Parameters; } } State CC_STATE_SUSPENDED { Stimulus CC_EVENT_RESUME { /* Received ccResume */ Action Set_A_Status_Free; Action Pass_Up_A_Status; Next_State CC_STATE_ACTIVATED; } } Superstate CC_ACTIVE(CC_STATE_ACTIVATED, CC_STATE_WAIT_CALLBACK, CC_STATE_SUSPENDED) { Prolog { /* Start QSIG_CCBS_T2/QSIG_CCNR_T2 depending upon CC mode. */ Action Start_T_SUPERVISION; } Epilog { Action Stop_T_SUPERVISION; } Stimulus CC_EVENT_TIMEOUT_T_SUPERVISION { Action Pass_Up_CC_Cancel; Action Send_CC_Cancel; Next_State CC_STATE_IDLE; } Stimulus CC_EVENT_SIGNALING_GONE { /* Signaling link cleared. */ Action Disassociate_Signaling_Link; } Stimulus CC_EVENT_LINK_CANCEL { /* Received ccCancel */ Action Pass_Up_CC_Cancel; Action Post_HANGUP_SIGNALING; Next_State CC_STATE_WAIT_DESTRUCTION; } Stimulus CC_EVENT_CANCEL { Action Send_CC_Cancel; Next_State CC_STATE_IDLE; } } }