isen.com: Writes David Isenberg: “I’m talking about a telephony program that runs in a vanilla Compaq Ipaq palm-sized device with a vanilla 802.11b wireless connection to the vanilla, unmanaged, public Internet. It uses plain old headphones and the Ipaq’s on-board microphone. It runs with Microsoft’s Pocket PC operating system. It sounded great — better than toll quality, better than the public switched telephone network. There was no telephone company in the loop (no dial tone, no service, no features, no billing) beyond pure Internet connectivity.”
The telephony software is made by Global IP Sound.