I've written a TAPI 2.1 application for a CME box. This app just uses lineMakeCall() to dial a number for a user on a 7931 phone. I would like to have the phone use the headset (not the handset or speaker) when I place the call. So far the only thing I've found that might do the job is the PHONEBUTTONFUNCTION_PRESSBUTTON function in then lineDevSpecificFeature function call. But I can't find any docs on how to use it.
So I have 3 questions:
1. Is what I'm trying to do possible?
2. Am I looking in the right place?
3. Where are the docs on lineDevSpecificFeature()?