Communication system with transparent subscriber mobility based on group registration

摘要

The present invention relates to a method for connecting a user to an internet protocol based communication system including a corporate domain and public domain, the method comprising the steps of assigning a unique user address to a user of the corporate domain as a public address, assigning a unique corporate domain address to the corporate domain, registering the corporate domain address in a gateway by using a unique address for the corporate domain serving as notification to the public domain that the corporate domain is available, and routing a call to the unique user address to the gateway.