Miniature VoIP GateWay with 2 FXS voice ports, 3 LAN 10/100BaseTX ports, 1 unpopulated 100Mbps SFP-based WAN/ Uplink (Please order the SFP in a separate line) port and PSTN (life line) port.For VoIP protocol types, please use one of the available suffix options - X=S for SIP, X=M for MGCP, X=H for H.323. Future protocol type change, after the product delivery, requires adding a SW KIT part number.