I am in a private call. I teleport away from the region where I am speaking to a friend. I have voice for maybe 10-30 seconds in the new region, then it fails. In the chat box it says "[5:44 AM] Second Life: Lycan Drascol started a voice call
[5:44 AM] Second Life: Lycan Drascol started a voice call" over and over until you hit the call button to stop it. Then you cannot reconnect to voice. I teleport back to the region I started at but I still cannot connect to voice either in local or private unless 1 or both of us relog. It does not appear to matter where I teleport to, the outcome is the same. Unless my friend comes with me, then we can stay connected.