The rise of Viber has, for some people, been a case of `skype, not again!' until now... Lumicall is now in the Android market - and it fully interacts with other SIP products using ENUM and SRV records. Any feedback on this is welcome. Interconnect (FreeSwitch calling to/from Lumicall users) is based on the idea of federated SIP, it is explained at http://www.lumicall.org for those who want to connect up to it. Please bear in mind: Lumicall supports ICE (RFC 5245) for NAT traversal, it is using the ice4j implementation from the Jitsi community. This makes the SIP packets bigger and often they are too big for the MTU of a UDP packet. When using ICE, it seems essential to use TLS, to avoid the MTU problems and also to avoid routers mangling the SIP headers (ICE doesn't need help from routers, they only confuse the algorithm) Various other issues are addressed in the release notes and FAQ http://www.lumicall.org/faq If there are specific issues with FreeSwitch compatibility (either for the Lumicall app, or for interconnect using ENUM/SRV/TLS) then I'm happy to start a dedicated page or wiki to collect the solutions in one place for FreeSwitch users.