Call deflection is a feature of voice over IP (VoIP) that automatically redirects a call from the called endpoint to another endpoint (usually a voice mailbox) when the called endpoint is busy. Call deflection is one of several forms of call diversion (also known as call forwarding) defined under the H.450.3 specification.
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In call deflection, there are three communications points, referred to as the originating gateway (the point from which the call is made), the deflecting gateway (the called endpoint), and the deflected-to gateway (the ultimate endpoint). Calls are deflected by a command called the reroute invoke. VoIP call deflection may not work for calls originating under other protocols or from all types of communications interfaces. For example, in a Cisco gateway, only calls in H.323 protocol are deflected.