METHOD AND APPARATUS FOR INBOUND ROAMING OVER CELLULAR VOICE CHANNEL

摘要

An Internet Protocol (IP) telephony system comprises a radio communications interface and a processor. The processor is configured to execute a Communications over Internet Protocol (CoIP) application for an Internet Protocol (IP) telecommunication service; obtain an indication of a change of a Subscriber Identity Module (SIM) card of the mobile telephony device; and upon obtaining the indication of change, and generate, for sending over the radio communications interface, a registration message to the IP telecommunication service, the registration message including a new International Mobile Subscriber Identity (IMSI) for the mobile telephony device.

主权项

1. A method of operating a mobile telephony device comprising:
executing, on a processor of the mobile telephony device, a Communications over Internet Protocol (CoIP) application for an Internet Protocol (IP) telecommunication service which is not native to the mobile telephony device; obtaining an indication of a change of a Subscriber Identity Module (SIM) card of the mobile telephony device, wherein the change of the SIM card comprises a change from a first SIM card associated with a first network to a second SIM car associated with a second network; and upon obtaining the indication of the change, sending an update registration message to the IP telecommunication service, the update registration message including a new International Mobile Subscriber Identity (IMSI) for the mobile telephony device.