name: MGCF
full_form: Media Gateway Control Function
context: 5.1.2.1.3.1 Session Establishment - PSTN Initiated Figure 5.7 shows the Diameter transactions that are required between MGCF and CCF during session establishment initiated from the PSTN side. Figure 5.7: Message Sequence Chart for Session Establishment (PSTN Initiated) 1. The session is originated from the PSTN. 2. The session setup is triggered in the IMS. 3. The destination party answers and a final response is received. 4. MGCF forwards an answer message to the PSTN. 5. Upon reception of the final response, the MGCF sends an Accounting-Request with Accounting-Record-Type indicating START_RECORD to record start of a user session and start of a media component in the MGCF CDR. 6. The CCF acknowledges the reception of the data and opens a MGCF CDR. 5.1.2.1.3.2 Session Establishment - IMS Initiated Figure 5.8 shows the Diameter transactions that are required between BGCF, MGCF and CCF during session establishment initiated from the IMS side. Figure 5.8: Message Sequence Chart for
description: The Media Gateway Control Function (MGCF) is a network function responsible for controlling media gateways in the IP Multimedia Subsystem (IMS). It plays a crucial role in managing sessions, handling media streams, and interacting with other network functions such as the Call Session Control Function (CSCF) and the Billing and Charging Function (BCF).
explanation: MGCF is classified as a Network Function based on its role in controlling media gateways and managing sessions within the IMS, as highlighted by the context. The provided text from 3GPP TS 32.225 describes MGCF's involvement in session establishment procedures, both initiated from the PSTN side and the IMS side, demonstrating its functionality as a network component.
section_title: 5.1.2.1.3PSTN Related Procedures
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