Technology giant Apple is working on plans to facilitate integration of Cisco's Spark business collaboration service with iPhones in an effort to offer enterprise customers a better calling experience over Internet. Apple chief Tim Cook has said the company is making iOS devices to work better on Cisco technologies than any other mobile platform. "With iOS 10, we are making it easier to make and receive voice and video calls over IP (Internet Protocol). Now, Cisco Spark will integrate with iPhone for first-class calling experience. It's a seamless integration," Cook said in a video message at the Cisco Live Conference in Las Vegas.