Session Border Controller

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A Session Border Controller is a device used in select VoIP networks to exert control over the signaling and usually also the media streams involved in setting up, conducting, and tearing down calls. The SBC enforces security, quality of service and admission control mechanism over the VoIP sessions.

The Session Border Controller is often installed in a point of demarcation between one part of a network and another. Most Session Border controllers will be installed between peering service provider networks, between the enterprise network and the service provider network, or between the service provider network and residential users.

A Session Border Controller is like a Firewall for VOIP.
They are often configured as a SIP Back-To-Back User Agent (See SIP RFC).

In addition to firewall functions they also may provide services like NAT traversal.

See: NAT and VOIP for more information and watch the video on The Anatomy of Session Border Controllers and To Couple or Decouple Routing Intelligence from SBC.

Martyn Davies of Dialogic discusses Session Border Controllers as the often misunderstood "black magic" application for VoIP networks.

Although carriers often use Session Border Controllers for signal translation and security, most do not include the hardware-based signal processing needed for media transcoding. For all-IP environments, new elements are required that can mediate signaling, transcode among different media formats, and handle basic security issues. The concept of Multimedia Border Element (MMBE) meets these needs.


  • BLOX - Open Source SBC
  • CompleteSBC by Xorcom Intrusion prevention software for your CompletePBX IP-PBX
  • OpenSIPS-60,000 CPS on commodity hardware! A multi-functional, multi-purpose signaling SIP server - it can act as SIP Router/Switch, SIP Registrar, Application Server, Redirect Server, Load Balancer / Dispatcher, Back-to-Back User Agent, Presence Server, IM Server, Session Border Controller, SIP Front-End, NAT traversal Server, IP Gateway (SMS, XMPP) and platform for many other applications.
  • CloudAstrix SPE for Service Provider Edition
  • SVI-SBC Session Border Controller | Squire Technologies state-of-the-art SVI_SBC Session Border Controller provides a mature, proven carrier grade technology. Packed with feature-rich capabilities and comprehensive security features for the protection, management and rapid deployment of services in fixed and mobile operators NGN and VoLTE / IMS networks. A flexible licensing model backed by comprehensive support, over a decades experience and deployments in over 90 countries allows our clients to meet budget requirements and scale as and when future growth dictates.
  • Session Border controller Solution to keep your network secure, reliable and scalable.
  • Sangoma SBCs for Enterprise and Carrier
  • SmartNode Enterprise Session Border Controllers (E-SBCs) from PATTON Electronics provide network security, assured voice quality and integration with legacy voice systems for SIP trunk deployments. Omitting costly carrier-grade features, Patton’s affordable customer-premise E-SBCs deliver essential border-control functions at price-performance levels appropriate for small-to-medium enterprises (SMEs). Branded as SmartNode Enterprise Session Border Routers (ESBRs), Patton’s E-SBC portfolio delivers proven interoperability with all major brands of softswitches and IP PBXs, making it easy for carriers and enterprises to deploy future-proof Unified Communications (UC) systems quickly and profitably today. TCP rate control—unique in the industry to Patton SBCs—provides superior voice quality by ensuring data downloads do not disrupt nor impede voice traffic. SmartNode E-SBCs offer TDM telephony interfaces, including two and four-wire POTS analog FXS and FXO as well as digital ISDN BRI and PRI interfaces. Such TDM connectivity is essential for enterprises that want to preserve legacy PBX systems while adopting SIP trunking or preserve legacy PSTN connectivity over TDM interfaces when deploying SIP trunks in hybrid mode. H.323 support in SmartNode session border controllers ensures compatible interoperability of new, state-of-the-art SIP-base unified communications platforms with earlier H.323 installations of IP-based voice networking. Full Product Listing
  • Dialogic BorderNet 3000 Session Border Controller
  • Cisco 7600 Series Session Border Controller
  • Enterprise session border controller
  • Mediant 3000 E-SBC
  • YX Wireless - Lyric SBC , an enterprise-class session border controller in a half U 19" rack mount, with media transcoding.
  • CSRP - Kamailio-based Class 4 SIP routing, accounting and rating platform, enabling delivery of retail SIP trunking and wholesale SIP termination & origination. Featuring high-performance LCR, on-the-fly rating, far-end NAT traversal, and fraud detection.


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See also

NEOX Softswitch is a cost-effective VoIP solution that enables carriers and service providers to offer a VoIP platform supporting secure and reliable Class-5 features and functionalities over a packet-based network. The solution offers carriers and service providers the ability to launch competitive new service offerings quickly and easily to increase subscriber stickiness and revenue generation.

  • SVI_C4 Class 4 Softswitch | The Squire Technologies SVI_C4 Softswitch provides both Carrier and Enterprise markets with a high performance, scalable Class 4 SoftSwitch enabling the delivery of secure, reliable VoIP traffic and services over multiple IP networks.
  • SVI_C5 Class 5 Softswitch | The Squire Technologies SVI-C5 is a Carrier Grade Class 5 Softswitch with an in-built Session Border Controller. It offers comprehensive Class 5 features, has approval from major international operators and includes a white-labelled subscriber web portal.

  • VoIP Switch Best VoIP Switch for Wholesale & Retail VoIP Providers.

Created by: admin, Last modification: Thu 16 of Mar, 2017 (15:04 UTC) by johncal
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