Picture messaging with Emi-Ucp

[cyclid]

hi gurus,
i'm trying to send both sm and ems picture messages via gateway that uses logicagsm smsc (emi ucp).
i thought to use the same pattern i succesfully use for wappush messages, but while all messages are delivered, the handsets fail to open them. the messages themselves are fine, they are sendable via other smscs/protocols with no problems at all.
i use XSER field as defined in emi_ucp_specs_40, like this (this is a nokia sm example) :
<?xml version="1.0" encoding="ISO-8859-1" ?>
<DOC_SGS VERSION="1.0" SID="1234">
<SM_BIN SMID="1164127698430" MSISDN="xxxx"
XSER="0107060504158A0000">
30000007324420746573740200240010100100005554648E6 6086342743847565B1043DA5D704D0E 697C4A924CF87FFE0000
</SM_BIN></DOC_SGS>
where the value of XSER is built of:
01 - type
07 - length of udh
060504158A0000 - nokia sm udh for picture message.

maybe i should play with DCS value instead?
i hope there is someone here who succeeded with this issue.
thanks a lot for your help!