Download from dtmf.zip and extract it and run the snippet. (the script has to be in the same folder as the extracted files.)
have fun

PS: just put your receiver on your speaker and call dtmf.pl 0123456789 (or any number that makes more sence to you! :] )
#!/usr/bin/perl

use strict;
use warnings;

use Win32::Sound;

$|++;


my $number = $ARGV[0];
unless(defined $number)
{
    printf("Call $0 <number to dial>\n");
    exit 255;
}

print "Dialing: ";
foreach my $ton (split //, $number)
{
    next unless $ton >= 0 or $ton <= 9;
    print $ton;
    Win32::Sound::Play("$ton.wav", SND_NODEFAULT);
}

print "\n";

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In reply to shabby Computer Telephony Integration on Win32 by esskar

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