Billion Softswitch works as a switchboard in VoIP SIP/H323 networks allowing to proxy both signaling and media streams, to perform cross-protocol conversion and even to do media stream transcoding. Billion Softswitch improves carrier or enterprise VoIP network using advanced call routing features as well as embedded compact billing system. Main features: * SIP/H323 calls routing, * Subscribers registration by SIP Registrar and RAS, * Call authorization, * Call data record (CDR) list maintenance, * Embedded billing system, * Interface to external billing system, * NAT/Firewall support, * Reports generation. Advantages: * Easy installation and maintenance, * Various operating system support (Microsoft Windows, Linux, Solaris), * Scalability due to clustering technology, * Administrative web-interface, * Log maintenatnce with different levels.