Media services – many of the new generation of SBCs also provide built-in digital signal processors (DSPs) to enable them to offer border-based media control and services such as:.Regulatory – many times the SBC is expected to provide support for regulatory requirements such as:.Quality of service – the QoS policy of a network and prioritization of flows is usually implemented by the SBC.Protocol translations between SIP, SIP-I, H.323.SIP normalization via SIP message and header manipulation.Connectivity – allow different parts of the network to communicate through the use of a variety of techniques such as:.Encryption of signaling (via TLS and IPSec) and media ( SRTP).Malicious attacks such as a denial-of-service attack (DoS) or distributed DoS.Security – protect the network and other devices from:.SBCs commonly maintain full session state and offer the following functions: Additionally, session border controllers often provide measurement, access control, and data conversion facilities for the calls they control. The term "controller" refers to the influence that session border controllers have on the data streams that comprise sessions, as they traverse borders between one part of a network and another. It is the job of a session border controller to assist policy administrators in managing the flow of session data across these borders. In this case, filtering routers or other network elements are used to control the flow of data streams. A more complex example is that of a large corporation where different departments have security needs for each location and perhaps for each kind of data. As a simple example, at the edge of a corporate network, a firewall demarcates the local network (inside the corporation) from the rest of the Internet (outside the corporation). The term "border" refers to a point of demarcation between one part of a network and another. It is the job of a session border controller to exert influence over the data flows of sessions. Together, these streams make up a session. Each call consists of one or more call signaling message exchanges that control the call, and one or more call media streams which carry the call's audio, video, or other data along with information of call statistics and quality. The term "session" refers to a communication between two or more parties – in the context of telephony, this would be a call. This role has now expanded to include significant deployments between a service provider's access network and a backbone network to provide service to residential and/or enterprise customers. JSTOR ( January 2018) ( Learn how and when to remove this template message)Ī session border controller ( SBC) is a network element deployed to protect SIP based voice over Internet Protocol (VoIP) networks.Įarly deployments of SBCs were focused on the borders between two service provider networks in a peering environment. Unsourced material may be challenged and removed.įind sources: "Session border controller" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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