By default Voicegain MRCP ASR assumes that recognition should be done in English language (using a mixed US/UK model).
Other languages can be chosen for the ASR by means of the Speech-Language parameter within the MRCP RECOGNIZE request.
Currently only en (for English) and es (for Spanish) values of the Speech-Language are supported. If you need other languages please let us know and we will enable them for MRCP. Voicegain platform currently supports 12 languages.