get confussed with sendsms via cron

[if12076]

Hello everybody, im noob in gnokii. I get a problem here.
i have a perl script like this

#!/usr/bin/perl
use strict;

my $message = "this sentence should be sended";
my $destination = "0813186575XX";
my $to_exec = "/bin/echo \"".$message."\" | /usr/local/bin/gnokii --sendsms
$destination \004";
system($to_exec);
sleep(10);

It's OK if I call that script directly from shell. But when I install the script
in my cron job. It does not work

anybody could help me. thax

rasix