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In order for the MS to send and receive GPRS data the MS must
perform a PDP context activation after the GPRS attach (Shown in Figure 23). The PDP context activation
makes the MS known in the concerned GGSN and communication to
external networks is made possible.
The PDP context activation corresponds from the end users perspective
to "Logging On" to an external network.
The difference from using a dial-up connection over circuit switched
is that in GPRS the end user can have several PDP contexts activated
simultaneously if the terminal supports several IP addresses.
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