Hi all

For a while now I've been crushing my brains on how to best implement secure (read: encrypted) telephony on the n900. My focus is on media encryption, though signalling will have to be thought of as well.
What does the community think?

Here's the options I see so far:
- Use a ZRTP-enabled client (twinkle-port anyone? sflphone?)
- Extend existing telepathy framework to support encryption (gstreamer seems to support SRTP trough gstreamer-plugins-bad, what about key management?)
- Transparent (local) media proxy (proxy-to-proxy encryption - rtpproxy, mediaproxy?)
- On demand TLS-tunneling - VPN-style
- Other ideas?