Important information: The company that previously traded as "Feptias Limited" has now changed its name to "Smartvox Limited". The name was changed to more clearly reflect the business's focus in IP telephony. This web site is unlikely to have the most up-to-date information about the company or its products and you are advised to visit the new web site instead at: http://www.smartvox.co.uk The nearest equivalent to this page offering support and technical advice is here: http://www.smartvox.co.uk/support.htm

Voice over IP: SIP SIP Servers Explained SIP Basics: Registration SIP Basics: Outbound Proxy Server SIP Response Codes SIP and NAT: Why is it a problem? SIP devices behind NAT: What solutions are available?