Motorola this week launched its CN620 phone, a dual-mode GSM/Wi-Fi device that can make and receive voice calls on a cellular network or enterprise WLAN.

Motorola’s CN620 flip phone works on networks with Avaya’s Enterprise Seamless Mobility infrastructure, also announced this week. The product package includes Avaya IP PBXs, call control server software from Motorola, and co-developed WLAN access points and switches from Proxim. The infrastructure allows CN620 users to roam between cellular and corporate VoWLAN networks.

The CN620 will work on WLANs based on 802.11a - the 5-GHz, 55M bit/sec wireless technology - and on a GSM cellular network. U.S. carriers supporting GSM include AT&T Wireless, Cingular and T-Mobile.

The device includes PBX-phone features such as hold, mute and speakerphone buttons, and is designed to support all Avaya PBX features.

The CN620 is based on the Windows CE 4.2 operating system, which allows it to run enterprise client-server applications designed for Windows CE. The device also includes a Certicom IPSec VPN client that allows the device to access a corporate network inside a company’s firewall. This could allow users with access to an external Wi-Fi connection - such a public Wi-Fi hotspot - to access corporate data such as directories and applications while connected to a cellular network call. The VPN client supports data only, not voice, Motorola says.

Software based on Session Initiation Protocol (SIP) on the phone also provides push-to-talk features, allowing users to access other CN620 phones inside a building over a WLAN. Avaya and Motorola say this feature can also work across WLAN-enabled offices connected over an IP WAN.

The CN620 will be available from Avaya resellers in the fourth quarter. Pricing was not released.