name: PSTN
full_form: Public Switched Telephony Network
context: charging information and is involved in the IMS call to judge the integrity of IMS charging correlation. In IMS Number Portability scenario, the following figure shows Call Flow from the IMS Network to the PSTN or PLMN Network. Figure 5.6.1: Call Flow from the IMS Network to the PSTN or PLMN Network The call steps are as follows. Step . 2. 3. A normal originating call flow. Step 4. 5. CSCF queries the ENUM/NPDB for the home PSTN or PLMN network of the called party. Step 6. The calling network routes the call to the MGCF according to the query result. Step 7. A normal call flow on the called party in the PSTN or PLMN network. In this example, it is supposed that operators don't need CDRs of all IMS NEs involved in this call flow. For this example only S-CSCF, AS and MGCF are configured to generate charging information. This means charging correlation is only applied to CDRs created by these configured IMS network elements. Thus the BD needs to know which IMS network element is
description: The Public Switched Telephony Network (PSTN) provides circuit-switched telephone services, including voice and data transmission. It is a global network often mentioned in relation to interworking scenarios between IMS (IP Multimedia Subsystem) networks and traditional telephony networks.
explanation: PSTN is classified as a Network because it is a collective set of interconnected network functions that deliver telecommunications capabilities, specifically circuit-switched telephone services. Its role in call flows and information exchange with IMS networks further supports its classification.
section_title: 5.6Scenario 5: Charging information from all IMS NEs including AS
biotag_Context: O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,B-Network,O,O,O,B-Network,B-Miscellaneous,I-Miscellaneous,O,O,O,O,O,O,O,O,O,B-Network,B-Network,O,O,B-Network,O,B-Network,O,O,O,O,O,O,O,B-Network,B-Network,O,O,B-Network,O,B-Network,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,B-Network,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,B-Procedure,O,O,B-Network,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Procedure,O,O,O,O,B-Network,O,O,O,O,B-Network Function,O,O,O,O,B-Network,O,O,O
biotag_Description: O,B-Network,I-Network,I-Network,I-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,O,O