Patent ID: 7492899
Filing Date: 2009-02-17
Classification: H04L

Abstract:
1. A method of authentication for Media Gateway, characterized in that the method comprises: providing each of a Media Gateway and a Media Gateway Controller with an initial key to validate digital signatures; said Media Gateway and said Media Gateway Controller performing a registration between the Media Gateway and the Media Gateway Controller and generating a shared key having a specific lifetime during the registration of said Media Gateway with said Media Gateway Controller by validating signaling messages used in the registration using the initial key, wherein the signaling messages include a parameter for generating the shared key and an initial digital signature generated by the initial key; for each call, said Media Gateway Controller and said Media Gateway authenticating a call message and a response message, each including a digital signature by using the shared key; and said Media Gateway and said Media Gateway Controller updating said shared key when the lifetime of said shared key is expired.