The GXW410x offers an easy to manage, feature rich feature IP communications solution for any small business or businesses with virtual and/or branch locations who want to leverage their broadband network and/or add new IP Technology to their current phone system. The Grand stream Enterprise Analog VoIP Gateway GXW410x series converts SIP/RTP IP calls to traditional PSTN calls and vice versa. There are two models - the GXW4104 and GXW4108, which have either 4 or 8 FXO ports respectively. The installation is the same for either model. Designed and tested for full interoperability with leading IP-PBXs, soft-switches and SIP-based environments.