| 摘要 |
Method when roaming by a mobile communication device (40) including a SIM card (41) identifying itself using an IMSI roams between a home network (10) and one or several visited networks (20,26,30,36), which networks are interconnected by a PSTN (1). The method includes the steps of: a) storing on the SIM card (41) a first IMSI associated with a first collaborating network (20); b) initiating a location update procedure using the first IMSI; c) triggered by the location update procedure and based on the first IMSI, causing an STP (Signal Transfer Point) (25) of the first collaborating network (20) to send a location update message to an ITP (Internet Transfer Point) (29); and d) causing the first ITP (29) to forward the message to an STP (16) of the home network (10) via a wide area network (6) and not using the PSTN (1). |
