[Headsheez] found a way to get his home phone service for free. He’s using a set of tools that we’re familiar with to route service from a typical analog phone system (which involves the extensions wired into your home) through a server to the Internet. On the hardware side of things this starts out with an Analog Telephone Adapter which translates the analog signal for use in a PBX system. He uses a copy of the open source PBX project called Asterisk which we’ve also seen used on devices like routers and the SheevaPlug. The actual telephone number comes from a Google voice account which for now is a free service but there’s no guarantee that it will remain that way in the future.

This should provide seamless service just like you’re used to with a traditional home phone line. There’s even caller ID for the number – but not the name – for incoming calls. The one big feature that is missing from this setup is the ability to call 911 for emergencies.

[via Reddit]

As you well know, today is March 14th – aka “Pi Day”.

Celebrated in math classrooms around the country, this truly is a celebration that belongs to the geeks. Here at Hack-a-Day, we too love Pi day, though we might not outwardly celebrate it with as much gusto as expressed by some of our readers.

[Chris Poole] is one Hack-a-Day fan who knows how to make the most of this mathematical holiday. He has put together a neat SIP-based phone service that reads Pi aloud to anyone who calls. He is running Asterisk in combination with Perl to read off the numbers, and is using a free SIP DID number to accept the calls. We gave it a shot earlier today, and were greeted by a gentle synthesized voice reading off the numbers of Pi. We’re not sure how many digits it is programmed to handle, as we stopped after about 20, so give him a call and let us know how many digits you make it through.

As a parting note, no Pi Day would be complete without a few obligatory Pi-related (albeit old) web comics and pastry concoctions, so here you go!

XKCD – Pi Equals…

XKCD – e to the Pi Times i

XKCD – E to the Pi Minus Pi

Spherical Pi Pie

Starfish PBX takes the very popular Asterisk telephony platform and adds an open source, fully functional web management interface. Asterisk allows you to be your own private branch exchange; think of it as your own telephone company. You can setup extensions in your home or office, configure an intercom system, implement a hold system with music, manage voice mail, and integrate Voice over Internet Protocol. Starfish PBX, available in alpha release today, aims to make Asterisk available to a wider user base by simplifying the interface used to setup and maintain the system.

[via Digg]

[I)ruid] opened with an explanation of his handle, since he catches a lot of flak for it being l33tsp34k (that’s supposed to be a capital ‘I’). The name has actually proven to be quite fun since it has broken a few systems that aren’t sanitizing input properly. Registering at Black Hat 2006 caused a database error. At the ShmooCon hacker arcade, he entered his player name and was dropped directly to a root shell. It’s also rather hellish on many webapps. His point was: why not choose a l33t name and have the fun of fuzzing all the time and breaking stuff even when you aren’t trying?

[nous] gave a quick plug for Ninja Network’s phreaking contest. Last year at Defcon was the first event they held. The first task was to use a butt set on a 25 pair block to find usable line. Once the random line was found they were dropped into a voice mail system to explore. The backend for the contest is Asterisk plus some custom Perl scripts. You can catch a preview version of this contest next month at LayerOne.

[jrandom] talked about how scratch-off cards can be gamed. Using a bright light or a resurfacing pen can help you with games that require a certain scratch order. Other cards can be identified by telltale signs they pick up during their production. Winners and losers are usually produced in two separate batches. Cards from each group will have the same cut quality, alignment flaws, printing color, and even the font could change. Sometimes the cards even have coding on them to indicate the winners (could be a simple as a W and L). All this is great, but the manufacturer might be doing this intentionally just to get attention.

[Travis Goodspeed] gave a brief introduction to reversing the Econolite ASC/3 traffic light controller for compatibility. It’s a PowerPC box running VxWorks 5.x and has snmp and FTP support. The FTP provides simple anonymous access. All of the control values are stored in the ASC3.DB binary file that’s checksummed. [Travis] built a way to describe a binary file structure as XML and generate libraries for reading the binaries natively in multiple languages.

We also thought [Dean Pierce]‘s network pentesting visualization framework was interesting. [Joel Voss] was attempting to write a softphone for the IAX2 protocol and ended up DOSing Asterisk. 30kB from the attacker could cause a massive amount of packets from Asterisk. He now has a framework for testing all aspects of the protocol.