I've been trying to send MMS Notifycation SMS's but I can't get it to work.

The SMS I'm sending is the following:

040636BE8C82986D6D73008D908A8C8E017F880381017F83687474703A2F2F7777772E746573742E636F6D2F7465737400

04 Push ID
06 Push PDU
01 length of headers & content type
BE content type
8C82 X-Mms-Message-Type
986D6D7300 X-Mms-Transaction-ID
8D90 X-Mms-MMS-Version
8A8C X-Mms-Message-Class
8E017F880381017F X-Mms-Expiry
83687474703A2F2F7777772E746573742E636F6D2F7465737400 X-Mms-Content-Location

What have I done wrong? I'm a bit confuesed about the Expiry format, so it might be it.

Please help...