ng-voice’s solution is cloud-native, easy to deploy, scales for any network size, and integrates with any infrastructure: MMTel/TAS, IP-SM-GW, AGW, MRF, Legal Intercept) and is based on 3GPP standard architecture. It is a fully-fledged VoLTE solution, including a lightweight PCRF and a broad range of application servers (e.g. Ng-voice’s fully virtualized turnkey IMS/ VoLTE solution enables voice services on any 4G, 5G, WiFi, or any other data network. To put it in simple terms, Session Initiation Protocol (SIP) signals and controls the multimedia communication sessions SIP is used for managing, maintaining, routing as well as authorizing and terminating real-time sessions. The signaling protocol that is commonly used to communicate is Session Initiation Protocol (SIP). In case of such a registration, the I-CSCF will add an emergency flag in the Diameter User-Auth-Request so that the HSS will ignore roaming restrictions. The P/I/S-CSCF implementations have been extended to identify emergency registrations. Ĥ – Emergency Services Implementation (incl. It communicates with the HSS using Diameter (Cx-interface) to retrieve information about authentication and in order to retrieve user profiles for triggering different application servers. The Serving-CSCF is the worker in the IMS world. If no S-CSCF is indicated by the HSS, the I-CSCF will select S-CSCF.ģ- S-CSCF – the Serving Call/Session Control Function The Interrogating-CSCF (I-CSCF) queries the Home Subscriber Server (HSS) and based on its response routes the message to the correct S-CSCF. This is to increase network efficiency by avoiding useless traffic transport and reducing latency.Ģ- I-CSCF – Interrogating-Call/ Session Control Function All requests need to go through the P-CSCF and that entity should be located close to the connecting endpoint. The P-CSCF provides the central entry point into the operator network. Below we have stated the roles of each element in the IMS.ġ- P-CSCF – Proxy Call/Session Control Function The IMS or the control layer is responsible for providing session control and governing communications based on subscription information and network policies. The image below shows ng-voice’s IMS architectural framework. Transport layer – This layer is responsible for supporting the architecture’s core network by acting as a gateway linking access layers and IP networks (ranging from Application servers for supplementary and other services, from SMS, Call-Forwarding or even more sophisticated services such as IP-TV). The control layer regulates the traffic between the transport layer and the service/Application layer by authenticating and distributing traffic (eg. Ĭontrol Layer – This layer is responsible for session controlling and management. 4G/5G mobile networks, Wifi or any other network infrastructure). Service Layer/Application layer – The application layer is where it hosts and executes services provided to users (e.g. These 3 separated layers provide functions to manage signals and traffic for multimedia applications. No portion of this site may be reproduced without the express written permission of the Las Vegas Raiders.The IMS architectural framework consists of 3 different layers (service/application, control and transport layer).
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