The Communication Manager supports the Confirmed Answer option for cellular voice mail avoidance for any OPTIM application, including Extension to Cellular. With Confirmed Answer set to
If the user wants to use the cell phone for both personal and business calls, the
option also notifies the user on answer whether the call went to the enterprise phone number, or directly to the cell phone number.
In some businesses with the Extension to Cellular (such as for after hours support), it is critical that a call be treated as answered only if a person answers the call. In such a scenario, Confirmed Answer is the only reliable voice mail avoidance method.
Confirmed Answer is the most reliable form of cellular voice mail avoidance. An added benefit of the feature is that the dial-tone is a signal to the user that the call is a business call, not a personal call.
See also, Setting up a Cellular Voice Mail Avoidance timer.