The SMS Server Tools 3 is a SMS Gateway software which can send and receive short messages through GSM modems and mobile phones. You can send short messages by simply storing text files into a special spool directory. The program monitors this directory and sends new files automatically. It also stores received short messages into another directory as text files. Binary messages (including Unicode text) are also supported, for example ring tone messages. It's also possible to send a WAP Push message to the WAP / MMS capable mobile phone. The program can be run as a SMS daemon which can be started automatically when the operating system starts. High availability can be ensured by using multiple GSM devices (currently up to 64, but this limit is easily changeable). Note: users should be added to dialout group to send/receive messages.