[1] Its voice and video software platform is used by carriers, mobile messaging apps, and social networks, serving more than 1 billion users in 100 countries.
Since 1996 the company is focused on embedded software products for IP communications.
Spirit's voice and video engines are targeted at various applications – PC and mobile communication applications (softphones, IMS-, Unified Communications and Enterprise Mobility clients), terminal user equipment with IP-connectivity (media phones, IP phones, IP set top boxes, Mobile Internet Devices) and infrastructure equipment (IP gateways, ATAs, media servers, etc.).
Spirit's VoIP software products are media processing libraries.
They include standard (like G.723, G.729, H.264, MPEG-4) and proprietary Spirit IPMR voice and video codecs for speech and video compression / decompression, RTP packetizers, echo and noise cancellation, packet loss concealment and error correction, adaptive jitter buffer, audio and video synchronization, CPU load and playback rate control, etc.