The Sangoma U100 is a low-cost development tool kit, ideal for those just getting started with Asteriskﾮ or those who just want a simple external solution. The USBfxo is easy to install. There is no need to open up the computer to insert an interface card. Simply plug it in, and set up your Asterisk system; configure Sangoma's Wanpipe drivers, as you would with any Sangoma card, and you're set to go. You can even connect multiple USBfxos in one system.