Abandoned Call Search works with ground-start analog trunks that do not provide disconnect supervision and react to a 500-ms break.

Some older COs can take up to two minutes to notify Communication Manager about a call disconnect. Communication Manager must, therefore, determine within one second if the call has been abandoned, before delivering the call to a hunt group. Call-handling statistics that CMS generates are more accurate because it is clear when a call is abandoned.

Abandoned Call Search adds an overhead of up to one second to each call delivered to an agent.