Section: 18.3 Interconnecting the Presence Network Agent and the GGSN
Content: The Presence Network Agent may be directly attached to the GGSN or via a Radius Proxy. If the GGSN needs to connect both to an AAA server and a Presence Network Agent for the same APN, but supports only a single RADIUS interface, the GGSN can be directly attached to the AAA server. The Presence Network Agent can in turn be attached to the AAA server, which acts as a RADIUS proxy. If the AAA server is configured as a RADIUS Proxy between the Presence Network Agent and the GGSN, the Radius Profile for the Pk Reference Point shall be applicable on the interface between the Presence Network Agent and the AAA server.