The sipX solution is an open source (LGPL license) Enterprise SIP PBX complete with voice mail and auto-attendant. Natively built on standard SIP, sipX is a full SIP proxy with all the architectural advantages that entails. In it's latest release the sipX proxy (2.7) is capable of processing 50.000 BHCC (busy hour call completions) on a single CPU P4 server, allows Web-based and remote management of large populations of phones and users, and fully embraces a distributed architecture. RTP media traffic does not go through the sipX server but is routed directly between end points. Also, sipX is not burdened with transcoding and other codec related operations as with SIP this is negotiated between phones and gateways directly.

Therefore and with all these attributes in mind, sipX is not only deployable as a full PBX but can also be used as a high performance Enterprise toll-bypass SIP router. It combines all common calling features, XML-based SIP call routing, forking, voice mail and auto-attendant, Web-based configuration, as well as integrated management and configuration of the PBX and attached phones and gateways.

sipX is a modular server based solution that runs on standard Linux. sipX does not require any additional hardware as it interoperates with any SIP compliant gateway, phone or application.

sipX is a native SIP communications solution strictly following and implementing all the relevant SIP IETF standards.