TTS Feature usage

Hello,

I found the TTS AT-Commands and would like to use it for a product. I´m Testing with the UMTS&LTE-EVB-KIT Quectel EG91 Revision: EG91EXGAR08A16M1G.

The Answers to all TTS related Commands are ERROR.
AT+QTTS=?
ERROR

Do I need to activate the TTS Feature? Or does this EG91 not have the feature? In the datasheet I did not find a note, telling me that this is optional.

Hi ,
Due to memory limitations, the TTS function currently only supports Chinese.