Abstract: There are disclosed an international roaming method, a roaming processing device and a communication system for international roaming of an international roaming subscriber of a first operator in a third operator network. When the international roaming subscriber of the first operator provided with a first operator IMSI and a second operator IMSI roams in the third operator network, the roaming processing device of a second operator modifies a first signaling message from a first operator network and carrying the first operator IMSI to a second signaling message carrying the second operator IMSI and transmits the second signaling message to the third operator network, and modifies a third signaling message from the third operator network and carrying the second operator IMSI to a fourth signaling message carrying the first operator IMSI and transmits the fourth signaling message to the first operator network. There is also disclosed a gateway device.

Abstract: There are disclosed an international roaming method, a roaming processing device and a communication system for international roaming of an international roaming subscriber of a first operator in a third operator network. When the international roaming subscriber of the first operator provided with a first operator IMSI and a second operator IMSI. roams in the third operator network, the roaming processing device of a second operator modifies a first signaling message from a first operator network and carrying the first operator IMSI to a second signaling message carrying the second operator IMSI and transmits the second signaling message to the third operator network. and modifies a third signaling message from the third operator network and carrying the second operator IMSI to a fourth signaling message carrying the first operator IMSI and transmits the fourth signaling message to the first operator network. There is also disclosed a gateway device.