Second Life Voice can be finicky. Getting it working when it isn’t can be a bit of a pain. There is a tool in Second Life to help you, Voice Echo Canyon. Also, the SL Wiki has some tips. The Phoenix Wiki as some tips too, but more slanted toward Phoenix. The Phoenix information is good for any third party viewer (TPV). Following are the links to some information you may not know.

The SL Wiki page is here: Second Life Voice. The SL Wiki index page on voice is here: Second Life Category:Voice. There are lots of handy tips and the etiquette for using voice. Newer stuff is in the Second Life Community Portal in Voice.

