Question: In a Gs interface configuration, what role(s) can an SGSN or a VLR assume when utilizing an intermediate SS7 network?
Option 1: Only as endpoints (SP functionality) with no intermediary roles.
Option 2: Exclusively as transfer points between entities (STP functionality only).
Option 3: Either as endpoints of the Gs interface (SP functionality) or as transfer points between a VLR and an SGSN (both SP and STP functionality).
Option 4: Neither SP nor STP; they always require a direct point-to-point link.
Explanation: In the context of the Gs interface utilizing an intermediate SS7 network, both SGSN and VLR offer flexibility in their operational roles. This includes acting solely as Service Switching Points (SP) when serving as direct endpoints or assuming both SP and Signaling Transfer Point (STP) functionalities to enable message routing between different network elements like VLR and SGSN. This dual capability ensures efficient and adaptable signaling within the telecom network.