| 摘要 |
PROBLEM TO BE SOLVED: To suppress the cost while guaranteeing the reliability of a caller ID set in a call, in a network including an IMS network and an untrusted relay network.SOLUTION: A conversion GW30 receives a call in which a caller ID with an electronic signature is set, and when the destination is an IMS network, authenticates the caller ID with an electronic signature, and when the authentication is successful, converts the caller ID with an electronic signature into a net grant caller ID, and transmits a call in which the net grant caller ID is set to a destination network. Furthermore, when receiving the call in which the net grant caller ID is set and the destination is not the IMS network, the conversion GW30 creates an electronic signature, converts the net grant caller ID into a caller ID with an electronic signature, and transmits a call in which the caller ID with an electronic signature is set to the destination network. |
