... interface for voice transmission, SMS and data transmission, supporting RS232 serial port. It meets all the demands for developing GSM/GPRS ... control by AT commands (GSM 07.07 and 07.05)Serial baud rate: AdjustableSMS(PDU/TXT) Audio features (EE_H_AMR, HEE_F_AMR, ... .Embedded TCP/IP stack (optional).InterfacesRS232 (V.24/V.28) Serial interface supporting:? Baud rate (bits/s): 300, 600, 1200, 2400 ...