This MIB module supports access point configuration
for GGSN in a GPRS system. GPRS [1] is a GSM network 
providing mobile wireless data communication services.
        
GGSN is the Gateway GPRS Support Node in the GPRS
architecture. It provides interworking with external 
packet-switched networks - PDNs or other data networks. 
        
GGSN is a software extension of a router.
        
A GGSN provides data access for its mobile subscribers 
to parts of the data network identified by the list of 
APNs configured on the node. 
        
The following diagram illustrates the network 
elements in a GPRS network, and the interfaces 
between them: 
        
    +=====+    +======+      +======+      +=====+ 
    | BSS |----| SGSN |--Gn--| GGSN |--Gi--| PDN |
    +=====+    +======+      +======+      +=====+ 
       ^                         ^
      /|\                       /|\
       |                         |
       | Visited access      +--------+
       | provider network    | Access |
       |                     | point  |
      \|/                    | table  |
       V                     +--------+
    +=====+
    | MS  |
    +=====+
        
Access points must be configured on the GGSN.
The Access Point Name is defined in GSM 03.03 [2] and 
consists of two parts, the APN Network Identifier and 
the APN Operator Identifier (more details in the 
object description in this MIB module). The 
cgprsAccPtTable contains the list of APNs supported 
by this GGSN and a set of engineering parameters that 
define the access point's operation. 
        
This MIB is also supported in the Evolved Packet
Core(EPC) architecture. The details of this architecture
is discussed in CISCO-EPC-GATEWAY-MIB description. Hence,
the MIB will be supported by GGSN Gateway, PDN Gateway(PGW),
Serving Gateway(SGW) and a combined PGW and SGW Gateway
SPGW(SGW PGW Gateway).
        
Acronyms and terms:
        
    3GPP   3rd Generation Partnership Project
        
    APN    Access Point Name
        
    BSS    Base Station Subsystem
        
    CAC    Call Admission Control
        
    COA    Change of Authorization
        
    CSG2   Content Service Gateway Release 2
        
    ETSI   European Telecommunications Standards 
           Institute 
        
    Gi     Name of the Interface between GGSN and PDN
        
    Gn     Name of the Interface between GGSN and SGSN
        
    GGSN   Gateway GPRS Support Node
        
    GPRS   General Packet Radio Service 
        
    GSM    Global System for Mobile communication
        
    Gx     Dynamic Charging and Policy Interface
        
    IMS    IP Multimedia Subsystem
        
    MME    Mobility Management Entity
        
    MS     Mobile Station
        
    P-CSCF Proxy Call Session Control Function
        
    PCO    Protocol Config Options
        
    PDF    Policy Decision Function
        
    PDN    Public Data Network 
        
    PDP    Packet Data Protocol         
        
    PLMN   Public Land Mobile Network
        
    QOS    Quality Of Service
        
    SGSN   Serving GPRS support Node
        
    UE     User Equipment
        
    VPN    Virtual Private Network
        
    VRF    VPN Routing and Forwarding
        
REFERENCE
        
[1] GSM 03.60: Digital cellular telecommunications 
    system (Phase 2+); General Packet Radio Service 
    (GPRS); Service description; Stage 2.
        
[2] GSM 03.03: Digital cellular telecommunication 
    system (Phase 2+); General Packet Radio Service 
    (GPRS); Service description; Stage 1.