Modem is a class 2.0 fax mode. Works better than class 2, if both are available, because its better standardized. You'll see if your modem falls into this category if decoding of incoming faxes with g32pbm doesn't work, but 2pbm -r does. This won't affect the reliability of fax reception at all, it will only ease decoding of the received pages. Not implemented yet .
Tells mgetty the chat sequence to use for initializing the modem.
This ordering was chosen because UUCP does it this way, and I wanted to avoid confusion here. In some cases, the modem can get stuck in a mode where it won't react to a simple AT command. Usually this happens because the modem is set to ignore a DTR drop and still has a data connection to the other side. If you use a voice modem, it could be stuck in voice mode. In these situations, the normal init-chat will time out, because the modem won't send the proper responses back.