Patent ID: 8964957
Filing Date: 2015-02-24
Classification: H04M,H04W

Abstract:
1. A telephone that is capable of accessing a memory for storing subscription information that includes a phone number, the telephone comprising: a selecting unit that selects one of items of subscription information stored in the memory as first subscription information, the first subscription information being associated with a first network operator and including a first phone number; a searching unit that searches the memory for second subscription information that is different from the first subscription information, the second subscription information being associated with a second network operator and including a second phone number; a bootstrapping unit that performs, over a communication network of the first network operator, a Generic Bootstrapping Architecture (GBA) bootstrapping procedure toward a Bootstrapping Server Function (BSF) of the second network operator using the second subscription information; an obtaining unit that obtains the first phone number included in the first subscription information, authentication information derived based on an identity of a call transfer server of the second network operator and a shared key that has been generated as a result of the GBA bootstrapping procedure, and a Bootstrapping Transaction Identifier (B-TID) that has been generated as a result of the GBA bootstrapping procedure, the call transfer server acting as a GBA Network Application Function (NAF) and the B-TID enabling the call transfer server to identify the second phone number with support from the BSF; a sending unit that sends a call transfer request, the B-TID, and the authentication information to the call transfer server, the call transfer request being for requesting the second network operator to transfer a call addressed to a phone number, which is identified by the call transfer server based on the B-TID, to the first phone number, wherein the call transfer request is authenticated by the call transfer server based on the authentication information; a receiving unit that receives a third phone number from the call transfer server as a response to the call transfer request; an input unit that inputs a called phone number; and a calling unit that makes a call to the third phone number using the first phone number as a caller phone number in response to the input of the called phone number, wherein the calling unit further makes a call to the called phone number via a phone call established as a result of making the call to the third phone number.