.conf file tutorials

Are there any tutorials on editing the .conf files. I have got to the stage where phones can log in and call each other but i need to how to develop the system further - play hold music, voice mail etc. Can anyone recommend anything?

did you try make samples from the asterisk source directory ? it will overwrite your current config, so back that up first.

otherwise, get yourself a copy of the Asterisk TFOT book, link is in the sticky at the top of the forum, as is the link to the voip-info wiki.