Oracle said Monday it was buying Acme Packet for $2.1 billion in cash, helping the business tech group expand its capacity to deliver voice, video and data over IP networks. "The combination of Oracle and Acme Packet is expected to accelerate the migration to all-IP networks by enabling secure and reliable communications from any device, across any network," the companies said in a statement. "Users are increasingly connected and expect to communicate anytime and anywhere using their application, device, and network of choice."