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User-Defined Data Types ............................................... 152 Type QueryProp ........................................................ 152 Type RecordProp ....................................................... 154 Type CallProp ............................................................ 155 Type SetCtrlParamProp ............................................ 156 Type DutyDuration .................................................... 157 Type CadenceChar.................................................... 157 Type SignalOnLine .................................................... 157 Type CPM_Param ...................................................... 157 Type HungUpBusy .................................................... 159 Type HungUpParam .................................................. 159 Type ToneMonitorParam .......................................... 160 Programming Tips ........................................................... 161 Questions & Answers ..................................................... 162 Chapter 8: VP-894 Interface Cards .............................. 165 EX-24 Analog Audio Multiplexer ................................... 165 I/O Base Address Selection ............................................ 165 API for DOS & Windows ................................................ 166 EX_INITIAL ................................................................ 166 EX_OPENALL ............................................................. 166 EX_CONNECT............................................................ 167 EX_DISCON ............................................................... 167 EX_STATUS .............................................................. 167 Demo Programs ............................................................... 167 Questions & Answers ..................................................... 169 EX-2424 Analog Audio Multiplexer ............................... 170 I/O Base Address Selection ............................................ 170 API for DOS & Windows ................................................ 171 EX_INITIAL ................................................................ 171 EX_OPENALL ............................................................. 171 EX_CONNECT............................................................ 172 EX_DISCON ............................................................... 172 EX_STATUS .............................................................. 172 Demo Programs ............................................................... 172 Questions & Answers ..................................................... 173
