Ppp Direct Access Call Flow - Cisco ASR 5000 Series Administration Manual

GGSN Support in GPRS/UMTS Wireless Data Services
3. If the MS is reachable, the HLR returns a Send Routing Information for GPRS Ack containing the address of the
SGSN currently associated with the MS‟s IMSI.
4. The GGSN sends a PDU Notification Request message to the SGSN address supplied by the HLR. This message
contains the IMSI, PDP Type, PDP Address, and APN associated with the session.
5. The SGSN sends a PDU Notification Response to the GGSN indicating that it will attempt to page the MS
requesting that it activate the PDP address indicated in the GGSN‟s request.
6. The SGSN sends a Request PDP Context Activation message to the MS containing the information supplied by
the GGSN.
7. The MS begins the PDP Context Activation procedure as described in step 2 through step 5 of the Transparent
Session IP Call Flow section of this chapter.
Upon PDP context establishment, the MS can send and receive data to or from the PDN until the session is
closed or times out.
8. The MS can terminate the data session at any time. To terminate the session, the MS begins the PDP Context
De-Activation procedure as described in step 6 through step 11 of the Transparent Session IP Call Flow
section of this chapter.

PPP Direct Access Call Flow

The following figure and the text that follows describe the call flow for a successful PPP Direct Access data session.
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