Patent ID: 7787441
Filing Date: 2010-08-31
Classification: H04L,H04M

Abstract:
1. A communication system, comprising: a plurality of communication elements, comprising: a request message is sent from the communication unit to the gatekeeper via the gateway in order to establish a trust relationship between the communication unit and the gateway, wherein the gateway checks the authenticity of the request message from the communication unit, wherein the gateway forwards the request message to the gatekeeper after the request message is verified as authentic, wherein the gatekeeper checks that the communication unit is authorized at the gatekeeper in response to receiving the forwarded request message, and wherein when the communication unit is authorized: wherein the trust relationship is established between the communication unit and the gateway as a result of the request message being verified as authentic and of the communication unit being verified as authorized, and wherein the first communication network and the second communication network are different networks.