Nuance Communications has signed an agreement to acquire Vlingo. The size of the deal was not disclosed.

Mike Thompson (Senior vice president and general manager, Nuance Mobile): Inspired by the introduction of services such as Apple’s Siri and our own Dragon Go, virtually every mobile and consumer electronics company on the planet is looking for ways to integrate natural, conversational voice interactions into their mobile products, applications, and services.

Founded in 2006, Vlingo is backed by Charles River Ventures, Sigma Partners, Yahoo and AT&T, and headquartered in Cambridge, Massachusetts.