Non latin symbols for send/received messages

I have PlaySms with Kannel set up at Ubuntu 14.04 x64 server, with MySql also instelled.

I send Sms via Web browser from Windows client completely fro cyrillic symbols (non latin) , that is;
http://gate.int.local/playsms/index.php?app=ws&u=testuser&h=usertokenop=pv&to=+7__________&msg=here is cyrillic symbols&format=xml

But I get error with empty either phone number or message.
And receive empty message to handset.

Message sent from Web UI (compose message) with cyrillic symbols is received normally to handset.

Also, when I send cyrillic (non latin) message from cell handset, I see @$#^#%& at message text at PlaySms Web UI.

How is to resolve this situation ?

I suggest to add conversion charset function before putting record to Db.

P.S.:
If I send sms it by curl with unicode=1, cyrillic symbols are displayed correctly, but 2 sms are appeared instead of 1 sms.
And If I send sms by Windows internet browser with unicode=1, cyrillic symbols are not displayed at all - message look like an empty.