The companies currently offer speech recognition and text-to-speech products and services to the likes of Vodafone, Wal-Mart, FedEx, Shell, ING and Sony.
ScanSoft, which was spun out of Xerox, had in recent years acquired call centre voice company Phonetics; text-to-speech expert Rhetorical; and ART Advanced Recognition Technologies, an embedded speech supplier.
Elizabeth Herrell, vice-president at Forester Research, said the merger could "infuse speech into new areas of business and deliver more cost-effective solutions to smaller and mid-sized organisations."
She added, "Speech technology continues to evolve and the future combined platform will hopefully contain what is best-of-breed for both vendors.
"Although the new company will combine product lines, this should not hold back buyers for speech solutions today."