Section: 4.2.2 Roaming architecture
Content: Figure 4.2.2-1: Roaming architecture for 3GPP accesses. Home routed traffic NOTE 1: Additional interfaces/reference points for 2G/3G accesses are documented in TS 23.060[ General Packet Radio Service (GPRS); Service description; Stage 2 ]  [7]. The figures 4.2.2-2 and 4.2.2-3 represent the Roaming with local breakout case with Application Function (AF) in the Home Network and in the Visited Network respectively. The concurrent use of AF's in the home network and AF's in the visited network is not excluded. Figure 4.2.2-2: Roaming architecture for local breakout, with home operator's application functions only NOTE 2: See TS 23.203[ Policy and charging control architecture ]  [6] for the role of and functions related to Home and Visited PCRF and S9/Rx reference points. NOTE 3: In figure 4.2.2-2, the control plane signalling and the user plane for accessing to Home Operator's services traverse over the SGi reference point via the Visited Operator's PDN. Figure 4.2.2-3: Roaming architecture for local breakout, with visited operator's application functions only