We are evaluating WISMO 228 module with our GSM/GPRS modem.
GPRS and SMS work fine.
However there seems to be a problem with the CSD (direct modem to modem connection).
The transmitting module would occasionally add extra symbols to the output data stream. This happens randomly.
Is this problem known? Any solution? Firmware update?
We tested a number of your modules - they all seem to have the same issue.