A packet switched IP call to a mobile user device in a wireless network is supported where the mobile user does not have a static IP address and where the mobile user is not engaged in communications in which an IP address is currently assigned. The originating party utilizes the directory number of the mobile user to initiate the packet switched call with at least an originating packet being directed to a home agent in the wireless network. The home agent assigns a temporary IP address to the mobile user's UE and translates packets addressed to the user's directory number to the assigned IP address. A switching node forwards the assigned IP addressed packets to the corresponding UE.