How GRX works?

hi all,

how GRX works ... what r the services that GRX is providing..

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GRX (GPRS Roaming Exchange) is described in a recommendation made by the GSM Association in order to attempt to standardize interworking of various GPRS networks as a baseline for future UMTS and other 3G networks to allow seamless roaming over GPRS.

The recommendation can be downloaded from and has a very good description of the services provided.

Services are basically routing and packet forwarding including GTP tunneling, DNS services, MMS internetworking, WLAN Roaming, IMS interworking, etc.

IT is in effect a set of rules which, if all GPRS operators adhere to them, customers will be able to roam seamlessly between operator networks. IF a DNS is e.g. not set up in a standard way you would have to reconfigure your mobile everytime you roam to a different network.

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