... GSM modem intended for data transmission viacellular communication networks with GPRS support (class 10) and TCP/IP protocol stack.External ... The main functionsinclude: data transmission by use of CSD and GPRS technologies, reception and transmissionof voice signals, faxes and SMS- ... UDP,HTTP, FTP, SMTP, POP3• Control by AT-commands (Hayes 3GPP TS 27.007, TS 27.005)• Toolkit for SIM-applications ...