i have the same problem with MO traffic :
Here's what i get in my access-log when receiving MO with some accents
like é ç ...
2006-03-01 17:49:02 Receive SMS [SMSC:SMPP-02-FT] [SVC:] [ACT:]
[BINF:] [from:25353512] [to:85057] [flags:-1:3:-1:0:-1] [msg:11:3]
[udh:1:00]
here's a normal access-log li
There's no difference between a non accentuated MO and an accentuated
one in the MWI flag, both of them got -1, the difference is on the
Coding flag (accentuated msg got 3, normal one got 1)
I think there's no actions todo with the operator, because when trying
whith another gateway software, it wo