Without some form of tuning, regularly using dual-mode mobile phones on an office Wi-Fi network tends to drain their batteries faster than usual, and those networks usually aren't designed with roaming voice service in mind, Khuller said. There have also been some other problems with mobile UC on Windows Mobile. For example, when users return to the office and their calls shift over to the private Wi-Fi network, the handsets sometimes bounce into speakerphone mode, according to Peter DeNagy, general manager of enterprise mobility enablement at Samsung. There have been patches for such things, but Samsung's work with DiVitas was intended to solve those issues "holistically," DeNagy said.

Samsung is only DiVitas' second major handset partner. Cooperation between the two companies will also bring DiVitas software onto CDMA (Code-Division Multiple Access) handsets for the first time in an optimized way, thus addressing a huge part of the U.S. market, Khuller said.

The API will enable DiVitas software to run on four upcoming Samsung CDMA phones for the U.S. (Epix, Saga, Jack and Omnia), as well as the GSM (Global System for Mobile Communications) version of the Omnia for global markets. Samsung did not disclose when these phones will go on sale.