ThbTapiApplication
Unit: hbTapi
Each application created hbTapi Components that including the unit hbTapi.pas and is using a TAPI device with ThbTapiLine or ThbTapiPhone has a "background" instance of ThbTapiApplication named hbTapiApplication. It is created within the initialization process of the program and destroyed when the program closes. hbTapiApplication is used to initialize the program's usage of TAPI and to provide all instances of ThbTapiLine and ThbTapiPhone with TAPI messages.

You don't have to create or free instances of ThbTapiApplication because it's a background instance created and destroyed automatically within hbTapi.pas.