Patent ID: 8737381
Filing Date: 2014-05-27
Classification: H04L

Abstract:
1. A method for enabling receipt of a call behind a network address translation device, comprising: receiving an incoming call setup message destined to an endpoint situated behind the network address translation device, wherein the incoming call setup message is received by a border element in a service provider communication network that is in communication with the endpoint via the network address translation device, wherein the network address translation device is deployed at a customer premises that is distinct from the service provider communication network, wherein the customer premises comprises a home network; establishing, by the border element, dynamically a tunnel on the network address translation device to allow the incoming call setup message to reach the endpoint, wherein the establishing comprises: receiving, by the border element, a call release message to tear down the call when the call is finished; and closing, by the border element, the tunnel on the network address translation device when the call is finished, wherein the closing the tunnel comprises sending a second command by the border element to the network address translation device to close the tunnel through the particular port on the network address translation device, wherein the network address translation device blocks all incoming voice over internet protocol calls except the voice over Internet protocol call that is established via the tunnel on the network address translation device by the border element in the service provider network.