the main core and media gateways residing at Telehouse London. A wide variety of customer equipment is used on the VoIP User network including desktop VoIP phones, softphones, mobile phones (using Fring on the Apple iPhone and Windows Mobile devices and in-built Wi-Fi functionality in Nokia E series), ATAs and open source switches and PBXes like FreeSWITCH and Asterisk. As VoIP User is a "Bring Your Own Device Network" best of breed solutions can be used by the end user. VoIP User enables these devices to be mapped to UK non-geographic numbers (typically 0844 or 0870) that have a per minute call rate low enough to fit in with VoIP User’s mode of operation. As an experimental network, several software vendors and private authors test their SIP devices using the VoIP User network. As of January 2009 there were over 250 SIP User-Agents known to VoIP User. Recently, the iNum initiative was launched, creating a special +883 country code (dubbed "Earth Area Code") that is intended to route calls for free (on-net) or low cost (from PSTN) irrespective of geographic location of the caller and callee. VoIP User is one of the handful of organizations signed up to this from the outset, and a practical result of this is that each one of VoIP User’s accounts now has its own 15-digit iNum telephone number. In the initial wave, VoIP companies have implemented iNum, but it is imagined that ultimately commercial Telcos will route these calls too at local call rates. Regulation VoIP User is a member of ITSPA, the self-regulating body for the VoIP industry. It complies with the UK number portability scheme so that users may take issued numbers to alternative providers. Website unavailability The Voipuser website became unavailable in late 2011. A major data loss caused the website to become unavailable and despite a short notice promising a rebuild it eventually failed to resolve to a destination in November 2012. However, as of December 2012, existing SIP accounts at sip.voipuser.org are still operational. As of March 2013 there is activity on the site again. References External links Status page Full country list Fair use policy Analytics page Dinstar VoIP services