This is a 4 port FXO SIP device. It allows you to add up to 4 regular phone lines to an IP PBX such as PBX in A Flash or FreePBX Distro. It's relatively easy to set up, and Grandstream provides setup instructions on their website. It's also the least expensive 4-port FXO SIP device - most other options don't include support and start at $400. You can get this for around $200.
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