What are the hardware requirements for the SMS callback module?  
The SMS module needs a GSM modem to be able to send/receive SMS messages. Usually, these kinds of modems are external, linked to the machine via a serial cable. The modem can be a dedicated one (like the ones provided by FALCOM) or a GSM telephone that has an internal modem (like the latest mobile phones from NOKIA and ERICSSON).



DOCUMENTATION
NewProcinctus Support Documentation HW Requirements