Gold said companies need to think about mobilizing forms of communication other than email, especially since he estimates that roughly 75% of enterprise workers are mobile at least 25% of the time.

"While email is deemed mission-critical by most companies and users, it is not the only communications medium that is needed," he wrote. "Despite the popularity and growth of email generally, voice is still the dominant form of workplace communications, especially for mobile workers."

Gold estimated that roughly 10 million to 12 million enterprise users employ mobile push email, but between 250 million and 350 million mobile workers use a cell phone for voice communications.

"Most communications in business today are still via phone, especially with a mobile device," he said.

Companies and users have grown accustomed to desk phone functionality, he said, and while the transition to similar functionality on a mobile device may not be easy, it is a natural progression.

"Like push email, which keeps mobile users in touch by providing data, the need exists for pushing additional forms of corporate communications to mobile users wherever they are located," Gold said. "Voice is a mission-critical function in nearly all organizations, which makes the features and functions of the ubiquitous telephone PBX compelling."

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