This section describes the sequence of events during far end hang-up.
Figure 1. Exchange data link: successful far end hang-up

Description of flows
The flows shown in Figure 1 are as follows:
- There is a connected call, which was established using channel associated
signaling.
- The network sends hang-up notification for the call over the exchange
data link.
- The signaling process notifies Blueworx Voice Response that the call has been cleared.
The signaling process creates an SL_CALL_TERMINATE_IND primitive,
and sends it to Blueworx Voice Response using the sl_send_indication() subroutine
call.
- Blueworx Voice Response terminates the current state table action with the Caller Hung
Up result.