Nethix WE120 (http://www.nethix.com/catalogo/client/we120_en.html) worked out of the box, no special configuration required in conf file.

Just set baudrate and no flow control, as we're using 3 wire cable (tx, rx, gnd).

Our SMS server is now working since 3 weeks with 4 WE120 modems and no service interruption.

Thanks to keke for the good work.