Special Charactors in Username

[Kartik]

I have my own radius client, communicting with a SBR radius server. 
The user name i send for authentication has special charactors - kärtïk

The Hex dump in the access-request packet for the name is 6B C3 A4 72 74 C3
AF 6B
[Attaching the snapshot of the dump].

Is it the correct format in which the name has to go? Bcos, even though it
is in correct UTF-8 format, the server rejects it saying invalid username. 
http://www.nabble.com/file/p13054115/Dump.jpeg Dump.jpeg 

Now my question is, is my Dump correct ? Is there any restriction in sending
non-ascii charactors ?
If at all there is no restriction, then is there a special way of
communicating the non-ascii charactors to the radius server.
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