Grandstream GXW4104 4 FXO Port VoIP gateway with dual 10/100 The GXW FXO IP Analog Gateway series offers the small enterprise, SOHO, remote offices and multi-location enterprises a cost-effective, easy to deploy VoIP FXO solution. The GXW410x series allows any business to seamlessly connect multiple locations with up to 8 PSTN lines, to an IP PBX system, or with an existing traditional phone system. The GXW series includes two models with 4 or 8 ports respectively Designed and tested for full interoperability with leading IP-PBXs, soft-switches and SIP-based environments Manageability, a simple configuration, superb voice and video quality and feature rich functionality Based on open industry standards