I'm using Kannel GW to send/receive SMS messages. The messages should be addressed to a certain 16-bit port, thus I'm trying to send the messages with the following UDH: "X-Kannel-UDH: 05040E06FDE8". This didn't work for some reason (the receiving application did not respond), so I sent it from one Kannel GW to another. On the receiving Kannel i got "X-Kannel-UDH: 040E06FDE8". As you can see, it seems that the IEI got "chopped off". Any idea why and how ? How can I use this correctly, so it works (the UDH that I send is the one that I get, I guess...) ?