Oracle is filling out its product stack for communications with the acquisition of Tekelec, which provides network signaling, policy control and subscriber data management software for mobile data networks. Terms of the deal, which is expected to close in the first half of this year, were not disclosed. The explosive growth of smartphones and mobile services has put new strains on mobile networks, and Tekelec's products can help providers manage these workloads as well as optimize profits, according to its website.