How to receive parameters from other programs who use tapi assisted calls like tapiRequestMakeCall through the tapi32.dll?

After call the RegReqMakeCallRecipient method, when other application make the call using tapiRequestMakeCall(), the OnRequestMakeCall event will fire and you can get the information from its parameters.

For more information about how to use this method or event, visit
RegReqMakeCallRecipient
OnRequestMakeCall