Network Call Redirection (NCR) provides Communication Manager call routing method between sites on a public network or a Virtual Private Network (VPN) that can reduce trunking costs. The cost reductions are particularly valuable in enterprises or multisite call center environments where trunk costs are high.

When an incoming call arrives at a Communication Manager server that has the NCR feature activated, call redirection is managed by the SIP service provider or VPN switch instead of the local Avaya server. As a result, trunks that the server otherwise retains to accomplish a trunk-to-trunk transfer are released after the call redirection takes place.

The cost reductions associated with reduced trunk use can be significant particularly when Avaya virtual routing features such as BSR with Expected Wait Time (EWT), are implemented. The cost-savings are achieved by the Avaya customer requiring fewer trunks to handle the same number of incoming or outgoing calls after the NCR feature is implemented within the local Communication Manager.