The SMSGate.3 software package include: the SMSGate.3 server, implemented as NT service for OS MS Windows; the SMSGate.3 client is a Win32 application which can be used on any MS-supported platforms; a kit of COM components; the SMSGate.3 SDK (option for PRO) - for creation of new user COM-components. Main functions the SMSGate.3 server: Reception and sending SMS via DB server; Sending SMS in a batch mode from command line; SMS content analysis and ability to conduct predetermined actions (type: external application call transferring to it the SMS message fields as parameters, sending SQL-query to an external DB with substitution into the query the SMS fields); Notification for connected clients on new SMS; Ability to receive the SMS delivery confirmation message; Interacting via SMPP protocol with SMSC of GSM operator; Using SMS reception rules depending on sender phone number prefix, keywords in SMS, device which has been used to receive the SMS; SMS delivery to rule-indicated users; Using SMS sending rules depending on destination phone number prefix; Sending SMS via rule-defined devices according to their priority and availability; Distinguishing access rules and SMS reception-sending rules; Support for Cyrillic and Latin alphabets. The SMSGate.3 server supports multi-user configuration and connection of any number of client workplaces. Versions of the SMSGate.3: LITE - for each GSM device the registration key, unique for each device is required. Does not support some types of devices and of additional services. PRO - a license USB-dongle is required. The base license supports connection of unlimited quantity of devices like GSM phone. Support of other types of devices or of services is can be carried out by means of purchase of additional licenses. DEMO - a demo in which there are some restrictions. For removal of restrictions it is required to get and enter a registration key of the device (LITE) or to get and install a license USB-dongle (PRO).