Terminating a trombone operation using third party hang-up

1. When the third party hangs up, CloseEverything, TerminateCall, or CloseHostServerLink tells IBM_Trombone_Custom_Server that this has happened.
2. IBM_Trombone_Custom_Server disconnects the caller and third party from the TDM bus and sends a HostEvent to the Caller state table to indicate a third party hang-up.
3. The Caller state table uses CloseHostServerLink to detach from IBM_Trombone_Custom_Server.

At this point, the caller is connected back to the state table application that invoked the IBMTromboneCall state table, and the third party has been disconnected.