Equipment vendors Motorola, Avaya and Proxim have announced that they are to collaborate in the production of converged cellular and wireless LAN network equipment, using VoIP technology. The venture aims to facilitate seamless roaming between enterprise and public networks for voice and data traffic. Sources at Motorola, which has agreed to develop Wi-Fi/cellular dual-technology handsets for the venture, claim that the goal of the project is to connect public hotspots, private hotspots in the workplace and personal hotspots in the residential market. Avaya will supply its Session Initiation Protocol IP Telephony software, while Proxim will contribute its voice-enabled W-LAN infrastructure. Trials of the joint offering will begin later this year.