1. What is SBC
SBC stands for Session Border Controller. It’s a discrete hardware device which sits in the perimeter of your network.
It looks at each SIP packet going between your Skype for Business Enterprise Voice network and the external ISP. It determines which packets should be allowed through, and which route they should take.
2. Functions of SBC
SBCs provide multiple security and mediation services within a VoIP environment.
It will monitor the external calls and determines that its legitimate or not.
Taking on this role helps stop a lot of bad things from happening. Within a Skype for Business deployment, SBCs can:
- Protect the network from Denial of Service attacks, spoofing, and other outside attacks
- Enable SIP trunking
- Support interoperability between different endpoints (e.g., different VoIP phone types, as I mentioned in the opening above)
- ‘Transcoding’ calls – Changing the codec used in a call, depending on the session type (audio, video), device type (tablets, laptops, phones), and bandwidth available
3. Functions of SBC in SfB deployment
To avoid DoS attacks and network break-in attempts.
Each phone can have a different bit rate. And if they do, they can’t connect to one another properly. Unless you use an SBC to bridge them (a process called ‘transrating’).
4. What SBC we should use for SfB
Listed below are the session border controllers that are certified for Skype for Business.
| Vendor | Product | Software Version |
| Oracle | Net-Net 3820 | ECX6.4.0 MR-5 GA (Build 455)* |
| Sonus | SBC 2000 | 4.1.1 Build 376* |
Note : We can run Skype for Business (or Lync Server) without a Session Border Controller. It’s not mandatory. But it is helpful.
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