recorded calls in mp3 format

I wrote a perl script that does this for any wav file over 7 days. I run it from cron daily.

#! /usr/bin/perl -w
    eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
        if 0; #$running_under_some_shell

# convert all wavs older than 7 days in asterisk directory to mp3s

use strict;
use File::Find ();

use vars qw/*name *dir *prune/;
*name   = *File::Find::name;
*dir    = *File::Find::dir;
*prune  = *File::Find::prune;

sub wanted;
sub doexec ($@);


use Cwd ();
my $cwd = Cwd::cwd();


# Traverse desired filesystems
File::Find::find({wanted => \&wanted}, '/var/spool/asterisk/monitor');
exit;


sub wanted {
    my ($dev,$ino,$mode,$nlink,$uid,$gid);

    /^.*\.wav\z/s &&
    (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
    (int(-M _) == 7) &&
    doexec(0, 'lame','{}');
}


sub doexec ($@) {
    my $ok = shift;
    my @command = @_; # copy so we don't try to s/// aliases to constants
    for my $word (@command)
        { $word =~ s#{}#$name#g }
    if ($ok) {
        my $old = select(STDOUT);
        $| = 1;
        print "@command";
        select($old);
        return 0 unless <STDIN> =~ /^y/;
    }
    chdir $cwd; #sigh
    system @command;
    chdir $File::Find::dir;
    return !$?;
}

exec '/sbin/wavremoveold';

I also remove the mp3s that are older than a month:

#! /usr/bin/perl -w
    eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
        if 0; #$running_under_some_shell

use strict;
use File::Find ();

# remove all mp3s older than 30 days in monitor directory

# Set the variable $File::Find::dont_use_nlink if you're using AFS,
# since AFS cheats.

# for the convenience of &wanted calls, including -eval statements:
use vars qw/*name *dir *prune/;
*name   = *File::Find::name;
*dir    = *File::Find::dir;
*prune  = *File::Find::prune;

sub wanted;



# Traverse desired filesystems
File::Find::find({wanted => \&wanted}, '/var/spool/asterisk/monitor/');
exit;


sub wanted {
    my ($dev,$ino,$mode,$nlink,$uid,$gid);

    /^.*\.mp3\z/s &&
    (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
    (int(-M _) == 30) &&
    (unlink($_) || warn "$name: $!\n");
}

HTH.

(Yes, I just used find2perl to do these.)