Hi Elton, In the past I was working for a mobile operator and we experienced the same problem, due to some particular ESME character encoding configuration on the SMSC side. For some reason the SMSC was configured to use ASCII charset so we used alt-dcs=1 in the Kannel's smsc-group to correct this issue and sent GSM7 encoded messages.
I would suggest you to check the ESME logs on the SMSC side to see what you get on the SMSC sent from Kannel. I agree with Falko it must be some configuration issue. BR, Jovan
