It is by effectively terminating each session then re-establishing it, acting as both a user agent server UAS and user agent client UAC for every signaling message on each call leg, that a SBC can granularly control a communications session. By processing each SIP header and payload, such as the Session Description Protocol SDP , complex rules can be applied to alter message elements and enable interworking.
Along with processing signaling messages, Session Border Controllers also handle all media traffic, typically in the form of RTP. This enables an SBC to not only secure the media flows but also apply transcoding where clients and servers are unable to negotiate common codec capabilities. The SBC is also the point where lawful intercept is performed.
As mentioned above, SBC is a demarcation or termination point of the SIP trunk connection in your communications network. Thereafter it determines where to route the session and what priority is necessary to assign to the session when the network is busy. The function also includes determining how much bandwidth is necessary for a session.
The network utilization and the policies established for the network determines the amount of bandwidth necessary. In addition to the others, the software performs SIP interworking. This allows devices that subtly seek different variants of SIP to communicate with each other effectively and efficiently. SBC smoothly performs the inter-working and interconnecting tasks, such as dealing with SIP variants and translating protocols, between different networks and the protocols running over them.
SIP has a lot of variants; an SBC software can translate these variants between devices so that the calls get through with all their features intact. SBC performs session admission control which means it inspects and sees who should be allowed to access the network and who should not.
To perform this task, it creates three lists: whitelists, blacklists and grey lists. With this task, it maintains the QoS Quality of Service on the network. There are various ways for the SBC to achieve this.
It allows control of the VoIP signalling and media at an application level. We can set multiple policies on a single SBC. Advanced Routing includes a wide range of routing all of which have a similar end goal that is cost-efficient quality service. It is important to understand the differences between a carrier-grade Session Border Controller and a firewall. SBC is designed to manage and control real-time voice and video communications sessions.
While the conventional security product, the function of the firewall is to block or allow data communications flows. Most business owners, who are not much into the concept wonder if an SBC is similar to a firewall as they are not must sure about their exact requirements.
Once, you have set up your company, you need to apply all types of security protocols. So what type of solution do you need? Is it a Firewall or an SBC? It is possible to divide a computer network into seven layers. From the frame to the network segment, the Firewall works to control up to layer 3 and 4. They can achieve much faster time-to-market than having to procure, install, and implement the required compute, networking and storage infrastructure on their own private cloud.
They can reduce operating costs by eliminating the need for ongoing maintenance of the cloud infrastructure for an SBC because the public cloud provider handles this now. And they will gain flexibility and cost control when scaling SBC capacity, because public cloud resources are available on a subscription basis.
Delivering intuitive, reliable, scalable and automated management, an enterprise can quickly configure SBCs, identify and remediate issues, deliver improved customer experience, and do so at reduced operational costs. Ribbon Application Management Platform manages enterprise SBCs deployed across multiple domains - data centers as well as private or public cloud environments. The platform itself is designed using cloud native principles and can also be deployed in multiple data center and public or private cloud environments in standalone or high availability configurations, including options for geographic redundancy.
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