TeamTalk.h contains the API for creating a TeamTalk client application.
TeamTalkSrv.h contains the API for creating a TeamTalk server application. The TeamTalk server API is only available in TeamTalk 5 Professional Edition.
To get the TeamTalk5 and TeamTalk5Pro DLLs (shared libraries) download the TeamTalk 5 SDK. Alternatively manually build TeamTalkLib which will output the DLLs into this folder.