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GPRS Tunneling Protocol (GTP) is an Internet Protocol (IP) based protocol suite used to carry general packet radio service (GPRS) within the following networks:
GTP allows GSM customers to travel while staying connected to the Internet. GTP can be used with Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).
GTP is divided into three categories:
Used to provide better communication solutions, GTP was designed for GPRS core-networks. It is more reliable because it can be used with both UDP and Transmission Control Protocol (TCP) stacks. GTP was standardized within GSM-standard 9.60. All versions of GTP use UDP for transportation.
GTP has only two versions - 0 and 1. There are many differences between these versions. In version 0 signaling and tunneling protocols are integrated on a single port, but version 1 uses two protocols: GTP-C and GTP-U. Version 1 was launched with an attempt to support WAN communication such as X.25 transmission. Version 0 can be used with TCP and UDP, while version 1 can be used with UDP only.