This read-write TruthValue enables or disables V.110 detection on this line, and the line's signaling type must be set to CCS to enable it. V.110 is a rate-adaptation protocol for data over digital circuits, so enabling detection here lets the gateway correctly recognize and handle that traffic type on a CCS-signaled line. For example, an admin supporting ISDN data calls that use V.110 rate adaptation would need vismDsx1V110Enable set to true on a line already configured for CCS signaling.