HS GSM SMS is a C source library that provides a PC-based user application with access to a mobile phone's Short Message Service (SMS) functionality, according to ETSI standards: GSM 07.05 (ETS 300 585) - "Use of Data Terminal Equipment - Data Circuit terminating; Equipment (DTE - DCE) interface for Short Message Service (SMS) and Cell Broadcast Service (CBS)" GSM 03.40 - "Technical Realization of Short Message Service - Point-to-Point
ITU-T X.25 Protocol Module (with RFC1613 XOT) - C Source Library (supplied with full source code) implements ITU-T recommendation X.25 - Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode. HS X.25 includes HsDL (Data Link with RFC1613 Cisco Mode XOT) and HsSock (Winsock interface) for X.25 over TCP applications