Patent ID: 8578456
Filing Date: 2013-11-05
Classification: H04L,H04W

Abstract:
1. A method of authenticating a terminal in an IP Multimedia Subsystem (IMS) network node, wherein the terminal has a registered Line Identifier (LID) stored in the IMS network and the terminal requests access to the IMS network using a third party's fixed-line broadband connection having an in-use LID different from the terminal's registered LID, the method comprising: receiving by the IMS network node from an access network, an access request including the in-use LID and a terminal identifier for the terminal; retrieving by the IMS network node from a database, the registered LID associated with the terminal, and a list of alternative authentication methods allowed for the terminal; determining by the IMS network node, that the in-use LID received in the access request does not match the terminal's registered LID; in response to determining that the in-use LID received in the access request does not match the terminal's registered LID, selecting from the list by the IMS network node, an alternative authentication method for authenticating the terminal; and performing by the IMS network node, the selected alternative authentication method for the terminal.