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.