Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
GGSN Support in GPRS/UMTS Wireless Data Services
▀ How GGSN Works
▄ Cisco ASR 5000 Series Product Overview
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Figure 92. PPP Direct Access Call Flow
1. The Mobile Station (MS) goes through the process of attaching itself to the GPRS/UMTS network.
2. The MS sends an Activate PDP Context Request message that is received by an SGSN. The message contains
2. The MS sends an Activate PDP Context Request message that is received by an SGSN. The message contains
information about the subscriber such as the Network layer Service Access Point Identifier (NSAPI), PDP
Type, PDP Address, Access Point Name (APN), Quality of Service (QoS) requested, and PDP configuration
options.
Type, PDP Address, Access Point Name (APN), Quality of Service (QoS) requested, and PDP configuration
options.