U.S. operators blaze the IP multimedia subsystem trail

摘要

The IP multimedia subsystem (IMS) made its way deep into the psyche of the mobile wireless industry in 2005, with a plethora of vendors and application providers aggressively pushing the concept. But most mobile operators are moving quietly into the space, actively testing types of blended services that might attract customers. "Most operators around the world are at similar stages," says Sita Lowman, director of IMS product management and marketing with Nortel. "They are either in trial phases, lab trials or early market trials. In terms of operators saying they are going to deploy this year, they are few and far between."