udh record

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Hi, why in my php script im not able to get the udh record (udh=%u ) and i see it on the log   [udh:5:0003180303]     If i take the udh get var in php i recive an empty var (some strange char) I think becouse it is passed as hex value .. some one have a working php script to get correctly all param passed by kannel and get-url ?? thanks   Samuele