ADVANCED LINE SIMULATORSupports Very High Speed Data. Stimulates loop start phone lines * Allows 2-way communication between telecom devices or systems. Produces precise dial, ringback, busy, reorder and S.I.T tones * 911 mode for classroom training * Audio input/output jack for amplified speaker or loading voice mail systems * Provides name and number caller ID * High speed modem Support * Provides standard or distinctive ringing and 40V talk battery * 120 AC power supply