Short description of SMSC Relay ActiveX SDK 2.3: SMSC Relay ActiveX SDK library is a set of optimized ActiveX components for quick creation of applications implementing the SMS/EMS communication with the SMSC through TCP/IP. Features: Supported protocols SMPP, UCP, SEMA and CIMD2.; Receiving messages sent to short numbers; Send and receive of SMS, EMS, logos, ring-tones etc.; Send and receive 7-bit text, 8-bit binary data and Unicode (UCS2); Connection keep-alive functionality and more.