Hi
Is there a list of audio files that are required for the FreePBX system? I am looking at getting the prompts recorded to match our companies used voice talent.
Within the en folder, there are two files that contain a list of the audio prompts; however I would like a list of prompts that are actually used; as there are prompts in there such as ’ to hear a toilet flush, press’ - which I assume isn’t really required 
Also, in the root of the sounds folder, there is a selection of files, what is the purpose of these; are they actually used - I thought everything that was required was located within the en folder?
These files are:
cdir-matching-entries-continue
cdir-matching-entries-or-pound
cdir-please-enter-first-three
cdir-sorry-no-entries
cdir-there-are
cdir-transferring-further-assistance
cdir-welcome
dictation-being-processed
dictation-being-processed
dictation-sent
dictation-sent
dir-intro-fn-oper
dir-intro-fnln-oper
dir-intro-fnln
dir-intro-oper
enter-filename-short
intercom
pbdirectory-first-three-letters-entry
Lastly, whats the recommended file format, I had previously used SLN files?
Thanks
David