Festival CentOS 7 without Asterisk, Latin Spanish

Only I want to install a Spanish Latin voice for Festival, then I was looking for them. I'm using CentOS, but I can't find the TTS packages... I'm not Expert in this matter. I was looking for using google, but the information I found is Ubuntu and .deb extension files. Other based on Asterisk and FestBox... RPM My question are: - Is FestVox needed? - Is Asterisk needed? - Where I can get Latin Spanish voices, please links... - Have you step by step installation of this voices? Is it possible to use another TTS (Loquendo, aCapela, etc) On Festival, are they interchangeable? Thank you!