Wireless mobility provider Trapeze Networks has teamed with DaVitas Networks, a new provider of mobility software and appliances, to deliver the ability for handset users to roam freely between Wi-Fi and cellular networks without interrupting a call. Together with the Trapeze Mobility System Software and the company’s new LAN Mobility Exchange switches, companies will be able to give users the ability to communicate using VoIP (voice over IP) over internal wireless data networks.