Supports all high speed data, produces name or name and number caller ID data. Audio input/output for recording voice prompts. 40 V DC talk battery. Precise call progress tones (dial tone, ring back, fast and slow busy, SIT, and re-order tones). Standard and distinctive 20Hz AC ringing. Provides CPC breaks after disconnect. Touch Tone detection. Ringdown mode (no Touch Tones required). 911 trainer mode for classroom training.