Phase 3: The exchange sets up the outgoing call
(cont.)
nThe
control function orders the group switch to reserve a PCM time slot for
A and B subscribers at the outgoing PCM link
nThe
dual-tone receiver is disconnected
nThe
subscribers are connected to the correct time slot
nThe
B-subscriber exchange send a ringing tone to B and the respective
tone to A-subscriber
nThe
control function starts to monitor the call for
ncharging
nfor
observing when the call is about to end