Okay I've been looking around for an answer: https://community.secondlife.com/forums/topic/101076-sl-voice-not-working/ https://community.secondlife.com/forums/topic/420814-sl-voice-help/ https://community.secondlife.com/forums/topic/411510-voice-not-working-done-everything-in-support/ https://community.secondlife.com/forums/topic/321638-how-can-i-fix-my-sl-voice-it-no-longer-works/ https://community.secondlife.com/forums/topic/418383-there-is-a-problem-with-my-sl-voice/ As you see, seems that there is a lot of people with the same problem. I think, I've tried all the solutions they suggest above, without result, all except that one of locked ports by ISP. I've thought it might be a trouble of compatibility with some headset devices, brands, models, etc. I don't know, perhaps any conflict with the slvoice app which allows you to use voice chat. This use to happen with some videogames. I say this because most of the people with the same problem report their headsets work with other windows apps, but they don't work with slvoice.exe So I left this here, waiting for any lucky solution anyone could suggest. Thanks. Using Win7 Pro, last version of Firestorm viewer.