Phase 4: The subscribers concludes the call
nThe
call can be concluded by the A or B subscriber
nIf
A closes first the call is concluded immediately
nIf
B closes first a timeout is applied (usually 90 seconds)
nWhen
the call is terminated
nthe control
function tells the charging to be stopped
nfrees the circuits and timeslots reserved for the call in the pathway by
using a signaling system