The SMS server tools allow setting up a central SMS gateway. It
sends and receives SMS messages using a simple file-based
interface. It can accommodate up to 20,000 messages a month.

It supports an event-handler option that allows calling customized
programs or scripts after sending or receiving SMS messages.

The SMS Server Tools use one or more (max. 32) GSM modems to send and
receive SMS messages. Some modems may be equipped with SIM cards such
as Vodafone or Telmi ones. All messages are sorted in queues by the
provider. If one modem fails, it will be deactivated for one hour
before the software retries, while other modems run without any
restriction. The status information and alarms are logged with
syslog.