Works like a charm when using wifi. Via 3G, openvpn makes sure, your provider won't know what hit them.
Advantages:
- Cheap
- Your own PBX
- Crypto as long as you're dialing inside your PBX
- Enables you to use other VoIP-phones, too

It has a few disadvantages though:
- Eats right through your battery (esp. the wifi part)
- Bad coverage ruins your calls
- Needs root on your android for openvpn
- Needs some server (for asterisk && openvpn)
- Needs a bit know how to set up correctly (I'm doing lectures about that on ccc events in Europe)
- Has no end to end crypto, at least if you're callin outside (from your asterisk) lines

(Sorry for the previous comment - darn html formatting..)

Works like a charm when using wifi. Via 3G, openvpn makes sure, your provider won't know what hit them. Advantages: - Cheap - Your own PBX - Crypto as long as you're dialing inside your PBX - Enables you to use other VoIP-phones, too It has a few disadvantages though: - Eats right through your battery (esp. the wifi part) - Bad coverage ruins your calls - Needs root on your android for openvpn - Needs some server (for asterisk && openvpn) - Needs a bit know how to set up correctly (I'm doing lectures about that on ccc events in Europe) - Has no end to end crypto, at least if you're callin outside (from your asterisk) lines

...and according to the nginx-folks its blazing fast and can do wonderful stuff ontop of the already nice config script foo.

If you plan to do (performant) webapps, you should have a look at that.

Here's the ngx_lua module.

I sticked all the ones I could get my hands on onto my Loo. Makes perfect sense to me.