language
                                                    Specifies the language for synthesis. IETF language code or Vocalizer language name for a language.
| 
                                                                     Value  | 
                                                                
                                                                     An IETF language code (for example, "en-US") or a Vocalizer language name (for example, "American English"). DEFAULT: (none)  | 
                                                            
| 
                                                                     How to set  | 
                                                                
                                                                     
                                                                         Set in the session xml file for the application. Configure the <speechsynth> element located under <sessionparameters>, <speechserver>. Set in a VoiceXML application, using the xml:lang attribute in the <vxml> element. Set in the voice browser, using the Speech-Language header in a SPEAK, SET-PARAMS, or GET-PARAMS method.  | 
                                                            
| 
                                                                     Usage  | 
                                                                
                                                                     Always used (specified in one form or another when creating the TTS instance).  | 
                                                            
Run "nvscmdline -V" to see the list of installed voices.
Example in a session.xml:
<speechsynth name=" ">
    …
      <param name="language"><value>en-US</value></param> 
    …
</speechsynth>