... GSV SIM900 GSM GPRS module, Quad-band, industrial standard Sim900,SIM900 Simcom wireless module,Simcom modules,modulesGeneral ... USSD* Non transparent mode* PPP-stack Specifications for SMS via GSM/GPRS* Point to point MO ... July ,2010)* Embedded AT (available at Q3,2010) Specifications for Voice * Tricodec – Half rate (HR) – Full rate (FR ... I2C* GPIO* PWM* ADC GSM/GPRS module SIM340 Wireless modules