The Yeastar TA100 Analog Phone Adapter provides 1 analog interface for residential and small business users to cost-effectively convert existing analog equipment to IP-based networks. Yeastar TA100 is ideal for small businesses to achieve quick and easy connections to existing analog devices within a VoIP network. Use in conjunction with Yeastar and non-Yeastar manufactured IP phone systems to connect fax machines and analog phones. 1 RJ11 FXS port Convert analog to VoIP cost-effectively and efficiently powered by USB port. Portable design. quiet operation