Settings

• What are the system requirements to use the premium Yahoo! Voice services?
• How do I make sure that I can use the service before signing up?
• Can I use Yahoo! Voice services from behind a firewall?
• Can I use Yahoo! Voice on PCs at an Internet café?
• How can I change the sound volume?
• Can I make a Test Call before signing up?
• Can I change Caller ID info?

Calling and Dialing Instructions

• How do I make international calls in Yahoo! Messenger?
• How do I make domestic calls in Yahoo! Messenger?
• Can I call mobile telephone numbers?
• Can I call operator-assisted numbers?
• Can I dial using letters?
• Which firewalls support Yahoo! Voice services?
• What ports are used by Yahoo! Voice services?
• Does network connection speed matter?
• What kinds of network address translators (NATs) are supported?

Sound and Connection Issues

• Why is there an echo?
• Why is the other person’s voice choppy?
• I can't hear or be heard.
• Why do I have a connection problems?
• Why can't I connect to the voice servers?