Specifying port in UDH

Hello everybody!

I'm trying to send SMS from Kannel to Java WMA application running on mobile phone. To receive SMS my Java application needs port to be specified. As I got from many forums I need to set UDH as
060504184E184E
where
06 - length of UDH
05 - field for port specifying using 16-bit schema
04 - length of this field
18 4E - port of sender, in fact it doesn't matter so it's the same as the following value:
18 4E - port where my application expects SMS
so in sendsms request I specify: udh=%06%05%04%18%4E%18%4E
Message text is some test string.

Result is in log: udh=0. Why??

Also note, that Kannel is installed on main office side, I don't have direct access to it, and as far as I know it's quite old version.

Thanks in advance,
Nick