This is a very geeky picture of those of us of a certain age...

[Fat Tone]

I bet you can hear this picture:

https://www.dropbox.com/s/4fphtrgrnksfuf6/dialup-final.png

(image tags wont work)

[VJ]

Cool!
But it seems to be missing the ringing tone, after dialing the number and before the other modem answers...

[Fat Tone]

I guess that could be for a couple of reasons:

1. the ring tone itself will vary country to country and is not part of the spec., so has been omitted.
2. IIRC the number of rings before answering is configurable. As there is only a 2sec gap between dialling and response it may have picked up immediately?


Only on Murc!

[VJ]

Possible explanations...

This always on internet does take away a bit of the charm: the beeping and buzzing of the modem, the flickering lights on the black box, the anxiety on whether or not you'll get the connection, the anticipation, the sheer speed of V90 (well, my first modem was only 1200, and I frequently used mobile dialup at 9600).

[Fat Tone]

Props to the first murcer to work out the telephone number dialled...

[VJ]

That sounded like a challenge.. and I was bored at work... So I think: 15702340003.

Solution:
dtmf = dual tones... lowest frequency group is the row (1st row = lowest frequency), highest frequency group is the column (1st column = left) of the keys on the keypad. So you can see:
bottom frequencies = rows: 1 2 3 4 1 1 2 4 4 4 1
top frequencies = columns: 1 2 1 2 2 3 1 2 2 2 3
And then just combine...

[Fat Tone]

LOL, and how many people did you p-off while pressing the buttons on your office phone to work out the tones?

[Fat Tone]

BTW, in the uk a number that long wouldn't be local so it would start with a 0 or probably a 9 to get an external line.

[cjolley]

That sounded like a challenge.. and I was bored at work... So I think: 15702340003.

Solution:
dtmf = dual tones... lowest frequency group is the row (1st row = lowest frequency), highest frequency group is the column (1st column = left) of the keys on the keypad. So you can see:
bottom frequencies = rows: 1 2 3 4 1 1 2 4 4 4 1
top frequencies = columns: 1 2 1 2 2 3 1 2 2 2 3
And then just combine...

Interesting, That's what I got using this method:

[Fat Tone]

You just HAD to go and spoil it!

[VJ]

And I fell for it... hook, line and sinker...
I just scrolled through some parts of the image, as we actually had to learn this whole protocol (on the exam, I had to explain the null modem cable and why it works), and just overlooked the number section. Still, no excuse... but good that I had the same answer...

[Rakido]

if i'm not lost, the correct number is 4815162342

...

[cjolley]

47

[Fat Tone]

Shall I correct you if you are wrong?

[cjolley]

lolz