> Hey Guys,
>
> Pleas help me answer the following question. Sorry for being a bit
> off-topic. I have a GSM-VoiP modem with just 4 SIM Cards. Is there a
> known mechanism that allows me to use this modem for more than 4
> (albeit not at the same time) GSM numbers? Let's say the phone
> numbers of the SIM cards inserted in the modem are call real phone
> numbers. My goal is to have some 10 additional virtual phone numbers
> served by this very same modem.
>
> One way i thought this could be done is by forwarding the virtual
> phone numbers the 4 real phone numbers. Then, when somebody calls one
> of the virtual numbers, the Telco will forward it to the real phone
> number and it will end on Freeswitch box. My only problem is now that
> on the Freeswitch box I have no idea what virtual phone number was
> actually dialed. Any idea how to recover this phone number? I looked
> at the GSM specification and couldn't find a way.
>
> PS. Purchasing DIDs won't solve my underlying problem.
>
> Thanks,
> Max.