SPIRIT DSP announced its TeamSpiri Voice Engine Mobile is now powering more than 15 million users of the enormously popular and free mobile VoIP Viber application.

Backed by SPIRIT's Voice Engine Mobile, Viber offers HD (wideband) VoIP free calls from iPhone and Android mobile devices. Viber's free mobile VoIP app can make calls over 3G and Wi-Fi connections, bypassing the use of any cellular voice minutes; calls are free worldwide. Unlike other VoIP services such as Skype, Viber requires no registration or need to log-in to make calls.

"When Viber launched just a few months ago, the application quickly became #1 in the AppStore in many countries in just 1 month, and now, there are more than 15 million Viber users worldwide,” said Alex Kravchenko, SPIRIT's VP of S&M. "We're pleased with Viber's popularity as a real Skype alternative, and we're proud that our TeamSpirit Voice Engine Mobile is delivering the highest quality mobile wideband VoIP calling experience possible to the millions of Viber users worldwide on both iPhone and highly fragmented Android OS for the most popular smart-phones."

SPIRIT's TeamSpirit Mobile enables HD-quality voice and video communications on a broad range of mobile devices, addressing all impairments inherent with IP networks - such as congestion, echo, noise suppression, latency, delay (jitter), packet loss, lip synchronization, etc. - to secure high quality voice over Wi-Fi, LTE/WiMAX and 3G/4G networks. It includes highly optimized standard voice and video codecs, such as G.711, G.723, G.729, iLBC, SILK, H.263, H.264 and SPIRIT's patent-free wideband IP-MRTM codec. TeamSpirit mobile voice engine is available on all popular smartphone operating systems including iPhone iOS, Android, Windows Phone and Symbian.