I’ve worked on 1.8.* asterisk and there is the file called say.conf where I can change the algorithm of how to say digits and so on, to relevance other languages that there is not by default in asterisk. I cannot find the same in asterisk 11. Where can I find that configuration?
That file and functionality has not been altered or removed. You can get the sample of it in the Asterisk source code at configs/say.conf.sample