How send sms on another language?

[Mihailllll]

Hi!
How send sms on another language? It don't work and change text sms:
std::pair<std::string, int> smscId = client.sendSms(from, to, GsmEncoder::getUtf8(message), std::list<TLV>(), 0, "", "",smpp::DATA_CODING_UCS2);