The mgetty package contains an intelligent getty for allowing logins over a serial line (such as through a modem) and receiving incoming faxes. The companion program sendfax is used for sending faxes from the commandline or from other applications. The third main component is vgetty/vm which can be used with a voice-capable modem to implement an answering machine, a voice menu system, and similar things.
This software allows you to download the photos made with the Samsung SGH-v200 (and possibly other units) via the serial link cable provided by Samsung. More protocol information is provided in the source file to improve the software to manage call lists, phone books, and other features.