In the case where call timeout is reached, the daemon calls
hangup(486), terminating the call. However this hangup call is not
followed by any kind of callFailure() function call meaning that the
tone and media states in the manager will not be reinitialized. As a
consequence the daemon will continue to ring even if the call has
ended.

This patch addresses this issue.

Change-Id: I2573e444179d5c6329896580dca5dd0111e57c6f
Gitlab: #48