>>If what he wants is some noise recording, how about the following :
>>
>>ATDT1234567;A+chr(13)
>>
>>That will dial the number, drop back to command mode & then return immediately in Answer mode & go through the negotiation tones.
>>He could then delay as long as he wanted & then hang up.
>
>What does the A stands for?
>
>In my line, I would have something like this as I need to wait for a delay.
>
>ATDT1234567,,,,,,,;A
>
>It works. I hear a modem conversation on the recorded voice mail. <s>

A stands for Answer mode. So you are switching modem from "Originate" mode to "Answer" mode - it is the answering modem that tries to set the connection speed.

I thought you might need a delay, but not there - thought it might be :

ATDT1234567;+chr(13)
delay(x)
ATA+chr(13)

but if it works, great !