Abstract: A network requested PDP context activation (57) allows push applications (45) to unsolicited transmit push data to a mobile station (10). A gateway (30), GGSN (Gateway GPRS Support Node), typically initiates the network requested PDP context activation (57).

Abstract: A method manages an internet protocol address and time of validity. The method obtains (52) the IP address and validity time period for a mobile station (10). The IP address and validity time period are transmitted (53) to the mobile station (10). Prior to expiration of the validity time period the network (20) renews the IP address for a new validity time period.

Abstract: A network requested PDP context activation (57) allows push applications (45) to unsolicited transmit push data to a mobile station (10). A gateway (30), GGSN (Gateway GPRS Support Node), typically initiates the network requested PDP context activation (57).

Abstract: A method manages an internet protocol address and time of validity. The method obtains (52) the IP address and validity time period for a mobile station (10). The IP address and validity time period are transmitted (53) to the mobile station (10). Prior to expiration of the validity time period the network (20) renews the IP address for a new validity time period.

Abstract: A presence proxy (40) maintains presence information concerning a number of mobile units (80, 85) user agents (72, 74, 76, 78) and retains the presence information should the requesting user agent (10) be unavailable. Further, presence proxy 40 provides lists of user agents about which a particular user agent (10) is interested in having presence information. Further, presence proxy (40) maintains and minimizes a number of notify messages (126) sent to user agent (10). Lastly, presence proxy (40) maintains information when a user agent (10) loses or drops access (150) to the network (20).

Abstract: A method and system for supporting Internet Protocol (IP) services initiated through a public network, the services directed to a mobile device through a private network is disclosed. In operation these steps occur: assigning a long lived IP address and user name to the mobile in a wireless network; providing a server including a database that cross references the user name and the long lived IP address; connecting an address space for the private network to the public network using a network address translator (NAT); initiating a push session between a push client and the mobile by forwarding from the push client to the server the user name; retrieving and returning to the NAT the long lived IP address corresponding to the user name; and assigning a corresponding dynamic public address, using an ALG that is associated with the NAT and returning the dynamic public address to the push client.