New Phone Uses WLAN or Cel Networks

Reefa writes "Avaya, Motorola and Proxim this week are expected to announce a co-developed handset and enterprise network gear that let mobile phone users roam between cellular networks and wireless LANs to make/receive calls. The phone uses SIP to make calls when on the WLAN network and switches to using cellular network when out of WLAN coverage and vice versa. The device also supports Push-To-Talk over SIP. BTW, the phone runs WinCE."