Arabic & English SMS using SQLBOX - problem in encoding

Dear Experts,

I would appreciate it if anyone can assist with the below concern.

I am trying to send Arabic & English SMS from kannel using SQLBOX, and it
does not deliver perfectly (receiving it as ?????? for Arabic words); after
doing some analysis on the values sent between the Bearebox, SMS BOX, and
SMSC, I found out that the error in encoding happens when SMSC start
transmitting.

I have used charset=utf-8 and coding=2 on SQLBOX database request when
inserting SMS

Does anyone have any idea what the problem? Although I have no problem in
receiving the SMS in English with the charset UTF-8.

Regards