We have started our development task using GM 47. As the first step in our task for integrating system, I had tried to setup a demo system which comprises of 2 work-stations; one is connected to (an HAYES compatible modem with normal PSTN line) and 2nd station with the GM47 unit. The intention is to get both of them connected.
From the 1st station, we invoked the dial-out command (ATDT ..) and we can observe the 2nd station receiving RING. When we issue the ATA command (used to anwer a call) from the 2nd station, it returns OK indicating the command has been executed BUT the dialer(1st station) still could not establish communication. Usually, upon dialing out and being answered by ATA, the caller shall establish the connection and prompt messages CONNECT 9600 etc.
I believe that other possible faults have been eliminated since the replacement of the GSM module with (an HAYES compatible modem with normal PSTN line)works fine. Further, dialing through voice (normal telephone)is successful.
I would appreciate if you can provide suggestions regarding this issue. Thanks