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Reply To: Call flow for international Roaming


U cannot touch the IMSI part in the VLR but u can change the MSISDN part.
The solution you r talking about is possible if and only if the VLR has 2 records (1 dummy record) for a secondary imsi which is an exact copy of the primary record with a different IMSI/MSISDN pair.
This is a very very broad idea i can think of. If you get into specifics it becomes too complicated, since there needs to be intelligence to convert calls coming to number1 into number2, And also all map msgs would need to be transformed to update the secondary(number2) record.