name: SAP
full_form: Service Access Point
context: the SUA message (3) to PLMN 1 using the retrieved IP address of the SUA-SG node. - SUA-SG sends message (4) to SS7 network with destination PC. - SS7 network routes the message (5) to the appropriate PLMN. Figure 1: SS7 support services exampl (Point Code) Scenario 2: SAP (virtual IP addree) operation for load balancing and distributed processing (see figure 2) - Operational steps: - SUA proxy (SAP) node in PLMN N receives IMSI (registration request) from MS. - SAP node looks-up corresponding SAPC (E.164 number = 1-817-822-1999) in local DB/ENUM. - SAP node uses this as the unique E.164 (ISDN) number for the PLMN 1 in ENUM query message. - SAP node sends an ENUM query message (1). This is routed over other ENUMs to the local ENUM of PLMN 1. - Local ENUM/DB in PLMN 1 receives the message (1) and looks up the services/protocol (including SAP node's virtual IP address) corresponding to SAPC received in the ENUM query. - Local ENUM responds with message (2) with all services/protocols
description: The Service Access Point (SAP) is an interface that enables communication between different network components, specifically for service discovery and IP address retrieval of end service nodes. It plays a crucial role in load balancing and distributed processing scenarios.
explanation: Based on the context provided from 3GPP TS 25.933, SAP is classified as an Interface because it facilitates interaction between various network elements, such as SUA-SG nodes, SS7 networks, and ENUM databases, for the purpose of service discovery and IP address retrieval.
section_title: 6.7.8.4	Service discovery/IP address retrieval of end service nodes
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