What are the SIP settings?

To use FastVoip for example with X-Lite you can use the following SIP-settings:

• Username: yourusername@fastvoip.com
• Password: yourpassword
• Domain: fastvoip.com
• Proxy: sip.fastvoip.com

General

• What is FastVoip?
• How can I make free calls via the Internet?
• How can I call landline and mobile numbers?
• How much do calls cost?
• How can I send an SMS through FastVoip?
• How many SMS messages can I send at the same time?
• How much do SMS messages cost?
• What are the SIP settings?