name: IPSSF
full_form: Internet Protocol Service Switching Function
context: The call flows for a mobile originated (MO) calls are shown in Figure 8 and are further explained below: {1} The MS wishes to place a VoIP call. A PDP context must be established to allow an IP session to be set up. {2} The MS checks that it is allowed to place a call via RAS Admission Request message. {3} If the MS is allowed to place the call (gatekeeper routed) an H.225 Setup message is sent to the gatekeeper. {4} When the Setup message is received at the gatekeeper, if the O-CSI for the calling user is present, it would be possible to analyse its contents and if necessary invoke the IPSSF. The IPSSF is now assumed capable of implementing the CAMEL O-BCSM. Later sections in this report cover the mapping of the O-BCSM points in call and H.323 call state model. The IPSSF starts a dialogue with the gsmSCF. The gsmSCF address and service key to invoke are obtained from the triggering criteria in the O-CSI. {5} The gsmSCF sends the instructions to the IPSSF according to the service logic
description: The Internet Protocol Service Switching Function (IPSSF) is a network function that interacts with the gatekeeper and the gsmSCF to implement CAMEL O-BCSM for VoIP calls. It starts a dialogue with the gsmSCF based on triggering criteria in the O-CSI, enabling service logic instructions to be sent.
explanation: The IPSSF is classified as a Network Function because it plays an active role in controlling and managing the call flow, interacting with other network components like the gatekeeper and the gsmSCF, and implementing specific services (CAMEL O-BCSM) for VoIP calls.
section_title: 7.3.2	MO call requiring CAMEL interaction
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