considering that the GW1600 is really a form of Asterix is possible to add a new feature?, a small CDR in order to count the minutes per simcard. please excuse my English, use Google to translate for this post, thanks.
We can add a new feature that count total call time per gsm port, but not so soon. Due to we are working on the stability and some known bugs, pls give us some time. Once new feature available, you will be updated at the first time.