Actually, the ipaq *does* support full duplex audio now. PocketPC 3.0 doesn't, but compaq has provided a driver for WinCE, and the linux distribution supports it too. PocketPC supports an application called "Microsoft Portrait" and msn messenger for voice over ip. To provide maximal end-user benefit, the thing to do is probably put strong crypto into msn messenger/ms portrait, on desktop and handheld. "Off the shelf hardware" is pretty meaningless to users if they need to do the linux handheld install; I've tried before and even if you know a fair bit about linux, it takes over an hour, and is somewhat risky. Whereas if it's just a "download this app and it works" thing, it's a lot easier to get casual users. http://research.microsoft.com/~jiangli/portrait/ is the microsoft portrait page. It's MS Research, not MS MS, so it may not suck. Someone should probably contact the guy and see what's up. If they would support an open-source client, and add crypto to the protocol, it might be good. -- Ryan Lackey [RL7618 RL5931-RIPE] ryan@havenco.com CTO and Co-founder, HavenCo Ltd. +44 7970 633 277 the free world just milliseconds away http://www.havenco.com/ OpenPGP 4096: B8B8 3D95 F940 9760 C64B DE90 07AD BE07 D2E0 301F