SPIRIT DSP announces that its TeamSpirit Voice Engine Mobile is powering the new Viber application that offers free HD VoIP calls from the iPhone.

Available in the Apple App Store, 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. Viber product releases for Android, BlackBerry and Symbian are now in the works supported by SPIRIT.

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-MR codec. TeamSpirit mobile voice engine is available on all popular smartphone operating systems including iPhone iOS, Android, Windows Mobile and Symbian.