1 billion users in 100 countries

SPIRIT’s Mobile VoIP Client Viber Reaches 15 Million Users After Four Months of Service

TeamSpirit Voice Engine Mobile Delivers HD Mobile VoIP Calling to Viber’s iPhone and Android Smartphone Users

MOSCOW, Russia – May 26, 2011 –  SPIRIT DSP, the world’s top voice and video over IP engines provider, announced today that its TeamSpirit® Voice Engine Mobile is now powering more than 15 million users of the enormously popular and free mobile VoIP (Voice over IP) 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.


SPIRIT DSP is the world’s top voice and video over IP engines provider. SPIRIT’s innovative carrier-grade voice and video software platform allows carriers, OEMs and software developers to deliver superior quality and integrated voice and video over IP services for telcos, cable and mobile service providers, enterprises, internet portals and social networks. More than 200+ million channels in 80+ countries are based on SPIRIT’s platforms. SPIRIT software platforms power popular products from Apple, Adobe, ARM, AT&T, Blizzard, BT, China Mobile, Cisco, Ericsson, HP, HTC, Huawei, Korea Telecom, Kyocera, LG, Microsoft, NEC, Oracle, Polycom, Radvision, Samsung, Skype, Texas Instruments, Toshiba, Veraz, Viber, ZTE, among 250+ others. SPIRIT’s direct OEM customers jointly exceed 60 percent of the global smartphone market share.

VideoMost.com is the SPIRIT spin-off for multi-point video-web-conferencing service.

SeeStorm.com is the SPIRIT spin-off for 3D video software platform.

09 May 2011