6.4.  Initializations

The application main( ) function calls gateInitialize( ), which does the following:

1. Calls checkArg( ) to check for command line parameters and handle them accordingly.
2. Calls IPTResetSession( ) to reset the demo data structures and initialize all channels' states to INIT.
3. Calls ClearAllBoards( ) to reset the board structures to default values.
4. Calls gateConfiguration( ) to read information from the configuration file (gateway_R4.cfg or other CFG file determined by the user) and update the ConfigFileParm in the Session data structure.
5. Calls gc_Start( ) to open all configured, call control libraries.
6. Calls printAllLibs( ) to print library status (open or failed).
7. Sets-up the call-back handler, PDLsr_enbhdlr( ). The callback handler handles events that it receives from the SRL library. For more details see Section 6.5.2.  Handling SRL Events.
8. Calls pstnGetVOXChannels( ) which checks how many available PSTN voice channels there are by doing the following:
   • Gets number of PSTN boards, by calling PDLsr_getboardcnt( ).
   • For each board that was found:

· Calls dx_Open( ) to open an analog board, or dt_Open( ) to open a digital board.

· Calls ATDV_SUBDEVS( ) to get the number of channels on the board.

· Calculates the logical board and channel and saves them into Session.pstnParams

· Closes the board, by calling dx_Close( ) or dt_Close( ).

6. Call ipGetChannels( ) which checks how many available IP channels there are by doing the following:
   • Gets number of IP boards from #define MAX_IP_BOARDS in gatedefs.h
   • For each board that was found:

· Calls gc_OpenEx( ) to open the board

· Calls ATDV_SUBDEVS( ) to get the number of channels on the board

· Calculates the logical board and channel and save them in Session.ipParams

· Registers the board with the Gatekeeper by calling boardRegistration( )

1. Calls getGateChannels( ) to find the demo MAX available channels (the smaller of available IP or Voice Devices and the number of channels specified with the --n command line option, if used).
7. Calls pstnOpenFrontEnd( ) which opens the PSTN channels by doing the following. For each channel:
   • Calls gc_OpenEx( ), which returns the PSTN LineDevH, and saves it in Session.pstnParams
   • If the PSTN board is an analog board:

· Calls gc_LoadDxParm( )

· Calls gc_GetVoiceH( ), which returns the PSTN VoiceH, and saves it in Session.pstnParams

• If the PSTN board is a digital board:

· Calls gc_OpenEx( ), which returns the PSTN LineDevH, and saves it in the Session.pstnParams structure

· Calls gc_GetNetworkH( ), which returns the PSTN NetwH, and saves it in Session.pstnParams

8. Calls ipOpenDevices( ) which opens the IP channels by doing the following:
   • Calls gc_OpenEx( ) which opens all IP devices, returns the IP LineDevH, and saves it in Session.ipParams
   • Saves the channel number in the global array HandleToChannel[ ] according to the LineDevH handle
9. The application main( ) function calls waitForKey(  ), to receive keyboard input.

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