As mentioned in last reply, the answer is in the modem manual. See section 7 http://www.embeddedarm.com/documentation/third-party/ts-gsm1_gr47-48-manual.pdf
As mentioned in last reply, the answer is in the modem manual. See section 7 http://www.embeddedarm.com/documentation/third-party/ts-gsm1_gr47-48-manual.pdf