send-conf with Kannel

Hi everybody.
I am sending an mms message using Kannel as a gateway, and openwave-wap sdk as emulator. the message is sent properly, but the emulator keeps on saying "sending message". Does the sdk expect to receive a confirmation message? If yes, how should I do it?

the code I am using is from Heyman project:

header("Content-Type: application/vnd.wap.mms-message");
header("Content-Length: $msgLength",FALSE);
foreach ($confirm as $byte)
print(chr($byte));

Thanx in advance