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I have several remote devices that use GSM modem and gather data. I need to communicate with those devices from a PC station located in a office using the dial up connection. Is there a way to do this WITHOUT an additional GSM modem connected to that PC? Is there some way to accomplish PC to remote GSM device communication using e.g. VoIP or similar technology?

I want to avoid installing an additional GSM modem in the office and use some software solution instead.

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put on hold as too broad by Ward, Sven, Andrew Schulman, TheCleaner, Sirex yesterday

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I presume that the remote devices can only be contacted by the GSM modems. Do you already existing hardware in the office and are these true 2G modems with no GPRS functionality? –  Alastair McCormack Nov 5 '12 at 19:04
    
They do have the GPRS functionality. The problem with GPRS though is that I need to initiate the communication from the PC and modems do not have public IP. The application will contact the modem very rarely - typically once a year. Once a month is the maximum. So it is not worth paying for a public IP for each modem and I want to use dial up connection instead. If there is a GPRS solution without need of modem public IP, I can go for it too though. –  Jakub Jezik Nov 6 '12 at 6:05
    
So once connected to the remote modem, do you establish a PPP link? –  Alastair McCormack Nov 6 '12 at 10:02

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