For PSTN / Analogue Lines
The Grandstream FXO GXW range of VoIP (Voice Over IP) Gateways are designed to connect to PSTN / Analogue Telephone lines to allow them to work with a SIP based Telephone system. The Grandstream GXW4104 is a great example of a 4 line analogue FXO VoIP Gateway to work with a SIP based PBX, including many asterisk based telephone systems to enable 4 analogue telephone lines to be connected for inbound and outbound calling over the PSTN network. 
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