Communication Manager uses Abandon Call Search to identify abandoned calls.
Note:
Use Abandoned Call Search only for old COs that do not provide timely disconnect supervision. Most COs provide timely disconnect supervision and do not require this feature.
Before an incoming ACD call rings a hunt group member or agent station, Communication Manager checks if the calling party has abandoned the call to ensure that an abandoned call is not delivered to the agent.
If the calling party abandons the call, Communication Manager determines if the calling party is still connected to the ground-start trunk at the CO by opening the tip-ring loop at the CO end of the trunk for 150 to 200 milliseconds (ms). If the calling party is still connected, the CO does not respond. If the calling party is not connected, the CO sends a disconnect signal to Communication Manager within 800 ms. Communication Manager interprets the signal as an abandoned call and releases the trunk.
