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Asterisk 1.8 Released With Support For Google Voice
Thinkcloud writes with a note that long-standing open-source VoiP software Asterisk has just been updated, and it's packed with more than 200 enhancements, security updates, and new features — including calendar integration and support for Google Voice and Google Talk. Asterisk's fully-featured PBX includes call waiting, hold and transfer, caller ID, and other useful tools so it's a great option for small businesses that need to watch costs."
You are wrong. Asterisk 1.8 supports SRTP. I know, because I merged it myself. :-p
There's no place I can be, since I found Serenity.
As others have said, Asterisk becomes much more obvious if you have an ITSP (Internet Telephone Service Provider). Here's an example of what I have done with it. I moved to Japan 3 years ago, but I still wanted to keep in touch with my friends. Calling long distance to/from Japan is expensive, no matter what plan you have. So I bought a DID (Direct Inward Dial) for my old home town. This gives my friends a local number to call. It routes over the internet to my Asterisk box and rings a softphone on my computer in Japan. The DID costs me $5 a month. Of course, there is a huge time change between Canada (where I moved from) and Japan. Asterisk has voice mail. If my phone isn't running on my computer, Asterisk takes a message and emails me the contents. When I wake up in the morning, I can listen to the message from my email and call the person back. Outgoing calls cost me 2 cents a minutes to North America and there are unlimited plans with many ITSPs (I don't bother because I don't make many outgoing calls).
Even without an ITSP Asterisk is useful. Perhaps you are used to using Skype or Google Talk to make computer to computer voice calls. Asterisk lets you talk to your friends using SIP (and now I guess Google Talk), but still have all the PBX features. So for instance, if your friend wants to send you a voice mail via SIP they can. You can set up conference calls fairly easily as well. You can buy very inexpensive USB handsets that look like telephones and hook them up to your computer. If you set your softphone's audio device to the handset, it ends up working pretty much like a normal phone. Or you can buy a SIP handset (a bit more expensive) and simply plug it in anywhere you have a network connection. This allows you to set up as many extensions controlled by your Asterisk PBX as you want. It's handy if you have kids, especially since DIDs are really, really, cheap.
Finally, for some fun you can easily set up ring groups on Asterisk. Talking on a cell phone is generally expensive. Instead, you can set up a DID for your Asterisk box and everyone can call you there. If you have your softphone up, it will ring that first. If it isn't up (or you don't answer it) you can get it to call your cell phone with an outgoing call. You can even set up a voice mail menu that asks the calling person if they would rather leave a message or try your cell phone. And to be even fancier you can vary the response based on who's calling. If it's someone you don't know you can direct them to voice mail immediately, if it's someone you don't care about much you can just allow them to ring the softphone, if it's likely to be important than you can forward to your cell.
This should give you a few ideas. There are really an endless number of options. Especially since you have source code with Asterisk you can make it do whatever you want.