The big problem isn't compression - that can at least be disabled (in theory). Modems expect a circuit-switched network which guarantees zero packet loss and z

The big problem isn't compression - that can at least be disabled (in theory). Modems expect a circuit-switched network which guarantees zero packet loss and zero jitter. Even if you connect using G.711 μ-law (uncompressed), you're still using a packet-switched network subject to packet loss and jitter. There's just no way around that. In that regard nothing has changed. This setup is inherently unreliable. You can do it for fun, but trying to get it to work outside of a lab environment is never going to be production quality.