An upgrade to version 5 will let owners of enterprise BlackBerrys field calls to their office numbers over Wi-Fi in addition to the regular cell phone network. This is courtesy of the service's new-found support for SIP, a protocol for handling voice communications over the Web. Cisco's Unified Communications Manager provides the Wi-Fi-enabling muscle. The settings will include an option for prioritizing Wi-Fi or network calls.
As an enterprise service that corporations can pile onto their employees' BlackBerrys, MVS creates a unified business line that simultaneously rings office and smartphone. It includes caller ID, voice mail, and corporate security measures. RIM should roll out BlackBerry MVS 5 later this year.