IMS (IP Multimedia Subsystem) has been in development for more than ten years. Initially, operators providing mobile and fixed-line services used IMS as a means of unifying various access services in order to reduce network operating costs. However, over time, they found that the deployment of IMS was both complicated and costly, and the cost savings were not enough to ensure that most operators' investments were able to return.
The designers of IMS then stopped arguing, but instead shifted their focus to deploying new services and revenue growth from new businesses. However, due to the lack of "killer", new business is equally difficult to advance. Back in 2010, IMS faced the dilemma of lack of success. For most telecom operators, IMS is not their best project.
In recent years, the fate of IMS has undergone substantial changes.
All-IP networks are constantly being valued, and LTE networks that improve mobile data access are the dominant trends in current and recent investment plans for mobile network operators. For these operators, they only want to play one game, which is to provide VoLTE (voice over LTE) services.
At the same time, industry trends are moving toward virtual telecom operators, and IMS is a good starting point for virtual operators because it has painstakingly separated the service control (signaling) and transport (media bearer) layers from the outset. Service control and data transmission have different requirements for virtualization, but in general, virtualization of service control is relatively simple, and the transport layer can be virtualized, but not all operators.
So what does IMS have to do with our theme is SBC (Session Border Controller)? What can IMS and SBC do for each other?
IMS network architecture
We know that IMS does not have the SBC function, but it has the edge function of handling signaling and media services at the access and interconnection nodes. The names of these features will vary, depending on whether they are from the fixed-line system (TISPAN) or the mobile system (3GPP). The signaling elements of the two systems are the same, using P-CSC access and using IBCF interconnects, but the media elements are different: the mobile system uses A-BGF or C-BGF access, while using I-BGF or TR - GW interconnection. In an IMS network, the edge functions mentioned above can be basically equal to some functions of the SBC, but the SBC has far more functions than the edge functions of the IMS.
Dingxintongda SBC usually provides the following functions in the IMS network architecture:
1) Interactivity modifications related to signaling and media
This is especially important for IMS deployments. Although IMS is quite good at unifying various SIP standards, the actual network deployment requires interaction with traditional SIP devices that do not fully comply with the IMS standard. Moreover, some devices follow the IMS standard, but not every version follows.
2) Transcoding
IMS provides unified services for mobile and fixed line equipment, but these devices work in different environments and have different requirements for the network. Take HD voice as an example: fixed line equipment generally chooses G.722. Since it does not involve the compilation of patent royalties and uses sufficient bandwidth, mobile devices prefer to use AMR-WB, because AMR-WB provides better mobile devices. Quality, and royalties can be offset by equipment costs. When a call is from the mobile network to the fixed-line network, the device needs to transcode the call. At this time, the SBC deployed at the edge of the network can perform this task well (to avoid returning media packets from entering the core network).
3) Legal interception
In a non-IMS network, an SBC with lawful interception capability can simultaneously access signaling and media services and deploy at the network boundary, which is the best place to perform this function.
4) Security
Includes DoS/DDOS protection, abnormal device identification, traffic monitoring and more. IMS has a relatively secure framework to protect network access. It contains dynamic IPSec (or TLS) associated with each IMS user, providing excellent identity authentication. However, IMS is not able to handle DoS attacks, and DoS defense is the basic function of SBC.
5) Service level agreement execution (capability control)
6) Network topology hiding, cross-network and NAT traversal, bridging various network environments
7) Connect to the PBX in the IMS network
ZGAR AZ Mesh Vape Pods 1.0
ZGAR electronic cigarette uses high-tech R&D, food grade disposable pods and high-quality raw material. A new design of gradient our disposable vape is impressive.We equip with breathing lights in the vape pen and pods.
Our team has very high requirements for product quality, taste allocation and packaging design. Designers only use Hong Kong designers, e-cigarette liquid only imports from the United States, materials are food grade, and assembly factory wants medical grade without ground workshop.
We offer best price, high quality Mesh Pods,Pod System Vape,Pods Systems Touch Screen,Empty Pod System, Pod Vape System,Disposable Pod device,Vape Pods to all over the world.
Pod Systems Vape And Smoke,Vape Pod System Device,Pod System Vape Kit,Pod System Mini Vape Pod
ZGAR INTERNATIONAL(HK)CO., LIMITED , https://www.zgarvapepen.com