Secure voice software issues

phil karn's points about modem buffering interfering with type-of-service queueing are the strongest condemnations of modern modems, in my view. i wish someone would build a modem that recognized ip packet framing.

This is why you'd really want to run your modems synchronously. You'd just send HDLC frames that encapsulated IP packets (fragmentation may be required). This is how most IP routers work over serial links.