Complete Conference Before Answer on 4000

[abennett]

Does anyone know what configuration parameters I can change, if any, to allow me to complete a conference call on a HiPath 4000 before the consulted party answers?

I'm trying to make a conference controlling a virtual station through JTAPI. When I try to complete the conference while party B is alerting I receive the following error:

"com.siemens.cti.cstamodel.CSTAErrorCodeException
at com.siemens.cti.cstamodel.MonitoredDevice.parseErrorMessageAndThrowException(MonitoredDevice.java:1293)
at com.siemens.cti.cstamodel.MonitoredDevice.conferenceCall(MonitoredDevice.java:270)
at com.siemens.cti.cstamodel.LocalConnection.conferenceCall(LocalConnection.java:109)
at com.siemens.cti.cstajtapi.CallImpl.conference(CallImpl.java:677)
at com.onrelay.jtapi.JtapiExerciser.handle_CMD_CONFERENCE(JtapiExerciser.java:1042)
at com.onrelay.jtapi.JtapiExerciser.runCommand(JtapiExerciser.java:533)
at com.onrelay.jtapi.JtapiExerciser.handle_CMD_SCRIPT(JtapiExerciser.java:1693)
at com.onrelay.jtapi.JtapiExerciser.runCommand(JtapiExerciser.java:563)
at com.onrelay.jtapi.JtapiExerciser.loop(JtapiExerciser.java:507)
at com.onrelay.jtapi.JtapiExerciser.start(JtapiExerciser.java:497)
at com.onrelay.jtapi.JtapiExerciser.<init>(JtapiExerciser.java:364)
at com.onrelay.jtapi.JtapiExerciser.main(JtapiExerciser.java:37)
Exception in conference() : javax.telephony.MethodNotSupportedException"

The conference works fine when I answer the call before completing but fails when I just let it ring.

I'm hoping someone here has the expertise to help me out.

Cheers,
Alex