Extended Character Set in Kannel

Hi,

I wanted to ask about setting up a service in Kannel. The problem I am
facing, is when I send a message from a mobile using language other than
english (greek for example), kannel does not recognize the characters
(receives "?") , so every time it executes the "default" service. The
problem exists in all 3 versions of kannel that I used (1.2.1, 1.3.1,
cvs-20030722). Both Windows (Cygwin) and Linux platforms appear to have the
same problem. The phone I am using as an SMSC is a Siemens-S45. Greek
characters (as many others in a number of other european languages) appear
to be in the extended set of the ISO8859-1 (Latin 1). Any suggestions ? 

Thanks in advance

Panagiotis Stamatopoulos