The HT801 analogue telephone adapter (ATA) allows users to create a high-quality and manageable IP telephony solution for individual analogue phones in a home or office application. The product features 1 FXS port and 1 10/100Mbps port to extend VoIP services to an analogue phone. Supports up to 1 SIP account IMPORTANT NOTE: YOU NEED TO ALLOCATE AN ADDITIONAL EXTENSION FOR THIS PRODUCT.