Obihai OBi508vs Universal Telephone Adapter with 8-Phone Ports (FXS), T.38 Fax, PSTN Failover, 4-Port Ethernet Switch (1 GigE + 3 10/100FE), Supports 9 VoIP Accounts (SIP and Google Voice) and OBiTALK 8 FXS Telephone Ports - Use with Regular Phones, Faxes and Legacy Systems 4 Port Ethernet Switch - 1 GigE + 3 Fast Ethernet 1 Line-In Audio Port - Add Music-on-Hold Audio to Calls in Progress 1 Line-Out Audio Port - Use with Paging Systems - SIP Addressable 3 USB Ports - Use with supported Obihai USB Accessories OBiLINE and OBiBT