Okay, since Alfonso isn't sharing solutions I checked that my rusty knowledge.
For Server Edition/Application Server installation, only the English TTS engine is installed by default.
For other languages, you are supposed to download 3 additional ISO images from the same loacation as a Server Edition ISO.
When doing a manual install from DVD, the process prompts you to when to insert the language DVDs when required. How things works for a USB install I don't know.
However, for an existing installed system, it is still possible to retrospectively add the TTS engines for different languages.
[ol 1]
[li]Download the TTS language ISO files for the IP Office release from support.avaya.com. [/li]
[li]Extract the individual language RPM files from the ISO files. [/li]
[li]Log in to your systems web control/platform view menus and go to Settings | General. [/li]
[li]In the Software Repositories section, next to Applications click Browse and select the first language RPM you want to add. Then click Add. [/li]
[li]The Uploading spinner appears to just keep spinning so give it a minute or two and then go to the Updates menu. You should see TTSx listed as an application. [/li]
[li]Repeat for any other language RPM files you want to add. [/li]
[li]Now on the Updates menu, for each new language, click Install. [/li]
[/ol]
Stuck in a never ending cycle of file copying.