is a GPRS data session. Through the establishment of a PDP Context, the device is assigned an IP address, which is a prerequisite for sending or receiving IP traffic. The establishment of a PDP Context creates a data path from the mobile device to the local SGSN to the serving GGSN, which controls the required Access Point Name (APN). In order to establish a PDP Context, the mobile device must first register with the serving SGSN. This process is known as GPRS Attach.