Mobile networks will take the lead in establishing IP multimedia subsystem (IMS)-based next-generation networks (NGNs) and introducing next-generation applications, reports In-Stat. Wireline operators will continue to operate NGN overlays over the next five years, focused on revenue-generating independent point solutions, the high-tech market research firm says."There is no debate over whether IMS will be deployed," says Keith Nissen, In-Stat analyst, in a statement. "Since all network equipment is becoming IMS-compliant, carriers will be deploying IMS regardless of their intentions. Mobile networks are evolving to IMS to reduce OPEX.\u00a0Fixed-line operators, motivated by revenue retention, are deploying IMS-based point solutions on a very pragmatic basis; designed to meet each carrier\u2019s unique business goals. Whether service providers can adapt to meet the challenges of next-generation markets is a question still up for debate."Other findings from In-Stat\u2019s research, IMS\/NGN Network Strategies and Deployments, include:\n\nThe two main drivers for IMS deployment are OPEX cost reduction and revenue generation.\n\nSubscribers to IMS-based services are expected to grow from 10 million in 2007 to\u00a0more than\u00a0500 million by 2011.\n\nSpending on IMS control layer equipment will total $12 billion by 2011.Check out our CIO News Alerts and Tech Informer pages for more updated news coverage.