A communication system includes a communication network, and an
originating telephony device, a target telephony device, and a call
manager coupled to the communication network. The call manager signals
the target telephony device to indicate an incoming call from the
originating telephony device. The call manager includes an alternate
number list that identifies at least one alternate telephony device to be
signaled in response to the incoming call directed to the target
telephony device. The call manager additionally includes one or more
mapping tables associating a packet network address with each identified
alternate telephony device.