- Grandstream IP analog gateway with 4 ports - Support for 2 SIP account profiles, caller ID for various countries/regions - Support for T.38 fax, flexible dialing plans, security protection (SIPS/TLS), and comprehensive voice codecs - 4 and 8 FXS port media gateways - Two RJ-45 ports 10/100 Mbps (switched or routed) - Multiple SIP accounts (choice of 2 profiles per account) - T.38 Fax compliant - G.168 Echo Cancellation - Voice Activation Detection (VAD) - Comfort Noise Generation (CNG) - Packet Loss Concealment (PLC) - Supports PSTN/PBX analog telephone sets or analog trunks GSGXW4004