 Nortel leaped ahead on that issue alone; AT&T (now Avaya) and others gained ground and started to overtake ROLM.IBM's ROLM division was later half sold to Siemens AG in 1989, whereupon manufacturing and development became wholly owned by Siemens and called ROLM Systems, while marketing and service became a joint venture of IBM with Siemens, called ROLM Company.By 1992, Siemens bought out IBM's share in ROLM and later changed its name to SiemensROLM Communications.