Grandstream GXW4008 8 Port FXS IP Analog Gateway Support for 2 SIP account profiles, caller ID for various countries/regions.Failover SIP server feature in case main SIP server goes down Support for T.38 fax, flexible dialing plans, security protection, and comprehensive voice codecs Two RJ-45 ports 10/100 (switched or routed) 4 and 8 FXS port media gateways Supports PSTN/PBX analog telephone sets or analog trunks