Patent ID: 8576833
Filing Date: 2013-11-05
Classification: H04L,H04M

Abstract:
1. A method comprising: receiving a registration request at an edge device of a voice over Internet protocol system from a user device; selecting at the edge device a communication service providing device from a list of devices which provide communication services; sending the registration request to the selected communication service providing device; receiving at the edge device a first registration response from the selected communication service providing device; modifying a registration window field of the first registration response at the edge device to a second value shorter than a received value to cause the user device to re-register within a time period based on the second value; sending a modified first registration response from the edge device to the user device; modifying at the edge device a database entry to associate the user device with the communication service providing device when the first registration response indicates a successful registration; comparing an age of the first registration response to a threshold; and sending from the edge device a second registration response to the user device in response to a re-registration request and based on a result of the comparison.