Apparatus and methods are disclosed for bridging communications between a private network and a public network. A mapping that associates a first set of IP addresses of endpoints in the private network with a second set of IP addresses of endpoints in the public network is provided which enables communications between the private network and public network for network-address-translation (NAT). In response to a data packet having a first IP address of the first set of IP addresses, the data packet is used to determine whether the local line should be accessed. In response to an indication that the local line should be accessed, the identifier among the second set of IP addresses is used to activate an analog-telephone bridging (ATB) circuit and redirect a call associated with the data packet by passing the data packet through the ATB circuit.