e in the HLR and dynamic IP address allocation will come ei- ther from RADIUS/DHCP servers within the private/corporate network or from the GGSN's internal addresses pool. Finally, the IP backbone will continue, as in GPRS, with the only difference that higher capacity LAN switches may be required. 3.2.5.5 Network Connectivity in the 3G Packet Core We do not expect major change in network connectivity for 3G PS either. For example, an access point (configured in the GGSN) will continue to be the logical connection point that the GGSN will provide to allow MS to attach to external networks4. Sub- 3 Putting together CDRs from various services. A single access point always refers to a certain external network, e.g. a company Intranet or an ISP. The UMTS Development Platform scribers, e.g., will continue to use one access point in order to access their own ISP pro- vider's services, and a 2nd access point to connect to the private/corporate Intranet. In general, the configuration parameters for an access point will include: static IP address range or dynamic IP address pool for subscribers set number of PDP contexts for the access point dedicated RADIUS server addresses and passwords (e.g. authentication and ac- counting) DHCP server address and IP address allocation method (e.g. DHCP, GGSN, RADIUS) user authentication method (e.g. RADIUS) and default router. To select the desired network access, the subscriber uses the Access Point Name (APN). The SGSN uses the APN to resolve the IP address of the correct GGSN. One GGSN can provide more than one access point on the same physical interface (e.g. Ethernet port) when using tunnelling to separate data traffic routed to different net- works. Likewise, we can link one access point to several GGSNs for redundancy or resilient using a round robin approach. 3.2.5.6 Implementing Quality of Service (QoS) QoS managed on a link by link basis, is also an inherent feature in 3G. Once the traffic has been classified dedicated and integrated for example, where the first would requir