Voice Chat:
- Open main window of your yahoo messenger.
- Look for a gray icon
, any user has this icon next to his name means he is offline or invisible. - Click voice icon
on the toolbar, if you dont see it then go to "Contact" menu and select "Enable Voice Chat".
- If User is offline then you ll get the following image:
"Interval server error. Cannot obtain voice token to start voice chat"
- If user is online but in invisible mode you will notice the voice toolbar marked red like the following image:



