Telos 2001-00243 Hx2 Digital Hybrid Telephone Interface (Analog I/O)Telos Hx2 two line POTS telephone hybrids are the most advanced hybrids ever developed for use with analog phone lines. Hx hybrids contain advanced 3rd generation Telos hybrids for superior audio quality; universal POTS interface features disconnect signal detection, which works with Telco providers worldwide. Hx hybrids include unique features to make operators' lives easier, such as Auto Answer with selectable ring count, a switchable mic line