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TAPI assigns session identifiers that are unique for each session and application. An application uses a session identifier to communicate with TAPI concerning a specific session. An application typically obtains an identifier either by creating a new communications session or when TAPI offers a session.
A session identifier cannot be used to pass information to another application. For this purpose, use the Call ID, which may be assigned by a service provider.
See Initiate a session for information on operations that create sessions and return a session identifier. See Respond to session initiated elsewhere for operations that acquire session identifiers from TAPI. See Terminate a Session for information on releasing session resources.
All service providers must support some form of session identification.
TAPI 2.x: The primary identifier of a communications session is the call handle.
TAPI 3.x: A session is represented by a Call Object and the primary identifier is a pointer to the ITCallInfo interface.