Linksys RT41P2-AT

Overview
2 RJ-11 voice ports for analog phones or fax machines with two independent telephone numbers

This device appears to be using the same board as the Linksys WRT54GP2, though the miniPCI slot is not populated on this model.
 * The OS used on this device is presumed to be the same (VxWorks) as the WRT54GP2's (and other derivative models).