Free PC-to-PC Calling
Can I call a friend on their PC for free? What are the system requirements for calling with Yahoo! Messenger? How do I make sure a call sounds as high-quality as possible? How do I make a call? What kinds of firewalls are supported to make PC-to-PC calls? What ports are used for calling with Yahoo! Messenger? How do I configure my firewall to make Yahoo! Messenger PC-to-PC calls work? How do voice messaging and call history work? Can I import ringtones or even record my own, and assign a ringtone to a specific person?
Open Talk
What is Open Talk and how do I use it? What is required to use Open Talk? Who can see that I have enabled Open Talk? Can more than one friend talk to me at the same time through Open Talk? I have enabled Open Talk, but my friends can't connect to me.