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I would like to connect my SIM900 to a PBX (phone switchboard). Is this possible either analogic or digital way? Many thanks

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    I'm not sure, but I don't think thats easily possible. The SIM900 (when I remember correctly) is like a very simple mobile phone. How should that connect to a PBX? I guess your PBX is just an electrical switchboard without a proper PBX server. A SIM900 is not meant for connecting to local phone lines. You would need proper hardware (don't know what) and fitting code to interface between the SIM900 and the phone line. – chrisl May 29 at 7:31