operator phone tones

thump · Post by **thump** » Thu Jan 12, 2006 7:23 am

been having some fun playing around with this...

http://hyperphysics.phy-astr.gsu.edu/hb ... elton.html

this is a little chart showing the grid that makes up the sounds that we hear when we dial the 12 standard touchtone keys on any phone from the last few decades (as well as "a" - "d"?). those long familiar tones are composed of two seperate frequencies being summed. so just use the last algorithm in operator, and dial in the appropriate freqs on a couple of the oscillators, and - voila! - you've got touchtones.

have fun!

Michael-SW · Post by **Michael-SW** » Thu Jan 12, 2006 8:56 am

You can then press your phone to you computer speaker and have Live dial for you.

Should work actually.

Machinate · Post by **Machinate** » Thu Jan 12, 2006 11:42 am

hehh.

"hello, operator?"

Michael-SW · Post by **Michael-SW** » Thu Jan 12, 2006 4:46 pm

David · Post by **David** » Thu Jan 12, 2006 4:51 pm

Hey, thats pretty cool that is. Simple tones are cool! And we can use the Goertzel algorithm to check what tones we pressed

icedsushi · Post by **icedsushi** » Thu Jan 12, 2006 7:11 pm

Has anyone else tried it for real?

sweetjesus · Post by **sweetjesus** » Thu Jan 12, 2006 7:56 pm

Interesting read regarding how phone tones and hacking grew together.

http://www.robson.org/gary/writing/phreaking.html

Speaking of phone tones and music you guys gotta check this link out.. one of my fave snippets of south park.. http://www.nextpimp.com/nextel_ringtones_Towelie.html

noisetonepause · Post by **noisetonepause** » Thu Jan 12, 2006 11:15 pm

Michael-SW wrote:You can then press your phone to you computer speaker and have Live dial for you.

Should work actually.

Only with very old phone networks I think... ie. not in this socialist paradise of state subsidies and modern technology:)

telekom · Post by **telekom** » Thu Jan 12, 2006 11:52 pm

Didn't some of the original phone phreakers manage to hack long distance calls for free by whistling the right tones down the phone? Ah, the golden age of whistling. I bet no-one here could do that now. In my day, if you couldn't whistle fit to make a blackbird die of jealousy, people thought you were... straaaaange...

Michael-SW · Post by **Michael-SW** » Fri Jan 13, 2006 8:50 am

I think their favorite device was some plastic whistle that came free with boxes of cornflakes.

DeadlyKungFu · Post by **DeadlyKungFu** » Fri Jan 13, 2006 8:11 pm

telekom wrote:Didn't some of the original phone phreakers manage to hack long distance calls for free by whistling the right tones down the phone? Ah, the golden age of whistling. I bet no-one here could do that now. In my day, if you couldn't whistle fit to make a blackbird die of jealousy, people thought you were... straaaaange...

That was the Captain Crunch whistle, it put out a 2600Hz tone that activated something in the system for free phone calls. That lead to the creation of 2600, the hackers/phreakers magazine. On some phones you could just hiss into the phone (make modem like sounds) for the same effect.

Back in the day I tweaked a Radio Shack phone dialer (changed the crystal) to get free pay phone calls. The new crystal changed the pitch of the tones, I think it was the # key that you would program into a preset,
1 # beep = a nickel
2 # beeps = a dime
5 # beeps = a quarter
It was great because at the time I had a 1200 mile long distance relationship, saved me thousands of dollars.

particle · Post by **particle** » Wed Feb 21, 2007 4:07 am

i would have loved that back in the old payphone days!!!!