Originally posted by Kumba:
It's based on FreeSwitch. That's all I know. That's essentially their modus operandi. The ASG product that we used was based on Postfix, ClamAV and SpamAssassin... all solid products, but not exactly point-and-click friendly.
They take the freely-available tech, build a manager-proof web interface for it, slap it on some commodity hardware and re-sell it along with a support subscription.
The licensing is nice too. They don't sell per-user licenses, or even license bundles. They sell you the hardware and a support contract, and tell you "This is about how many users this hardware can support. If you go over, we're not going to charge you or lock you out, but there will be a performance hit."