Patent ID: 8483673

Claim:
A method of controlling calls from an enterprise network to a communication device on a wireless provider network, comprising: configuring a wireless provider network to redirect a failed voice call to a call-back telephone number that is associated with an enterprise network rather than the voicemail number associated with the communication device; determining if the communication device fails to answer an incoming voice call and routing, if the determination is that the communication device fails to answer the incoming voice call, the voice call to the call-back telephone number associated with the enterprise network; establishing a voice call to the communication device without receiving a DTMF acknowledgment tone from the communication device to indicate that the communication device has answered the voice call; and redirecting the voice call to voicemail of the communication device in the event that identification information of the calling party is not attributable to the enterprise network, wherein the call-back telephone number is a direct inward dial telephone number of a private branch exchange; and the call-back telephone number is provided based on a land line telephone associated with a user of the communication device.