Which one to install?

I would like to make some simple AGI scripting :

Caller enters DTMF input : "var1"
Asterisk look up “var1” in a MySQL database, and returns “var2”, then play file “var2”.wav

What woud be easier for me, instal CentrOs then Asterisk, or just AsteriskNow or TrixBox?

asterisk now - easier learning curve