Categories: Small Business VoIP

How Does a Session Border Controller (SBC) Work?


A Session Border Controller (SBC) is a powerful back-to-back user agent device that sits at a point of demarcation for SMB and Enterprise businesses to provide services such as call control, security, interoperability and voice optimization. Let’s take a closer look at how a Session Border Controller works to optimize your VoIP performance!

Generally, the main duties of an SBC can be separated into four sections: Topology Hiding, IP Addresses Translation, Encryption and Transcoding, and Classification.

Topology Hiding

An SBC locates in the middle of the call path between a service provider and an IP-PBX. When a call is generated and arrives at an SBC from the PBX, the SBC filters out any sensitive information, so no outside intruders can exploit this information for hacking the enterprise VoIP network. This is called Topology Hiding.

IP Addresses Translation

An SBC also translates local IP addresses of the callers to the WAN IP address of the SBC and performs protocol normalization, a process that an SBC manipulates the call message to adhere to the service provider’s protocol implementation including possible number manipulation.

Encryption and Transcoding

Some SBCs also encrypt calls and perform transcoding when necessary. If an enterprise is connected to multiple branches and service providers, an SBC will decide where to route the calls to. It makes routing decisions based on multiple criteria: reachability, call cost optimization and path with the best quality.

Classification

So far, we have only talked about the outgoing calls. What about the incoming calls? It basically follows the same steps as for outgoing calls but with one extra layer of examination which is called classification, a process of careful inspection on the incoming calls to identify intruders and hackers.

More questions? Call 1-800-398-8647 to ask one of our VoIP consultants!

Ying-Hui Chen

Ying-Hui ( Evy), has been working at VoIP Supply since November 2015. She is currently working in the Marketing Department helping with market research, SEO analysis/ tracking, email marketing and blogs. Connect with her on LinkedIn.

Share
Published by
Ying-Hui Chen

Recent Posts

How to Prepare Your VoIP Systems for 2025

Remember Back to the Future II? I loved that movie because they traveled into the…

2 days ago

SIP Chats: Sharath Abraham of Jabra – Panacast 50, BYOD Solutions, and More!

https://youtu.be/qsNO-fZdY3U?si=1A2biOpTwvHG-wiB In the latest episode of SIP Chats, host Brian Hyrek sits down with Sharath…

3 days ago

Watch Now: 2024 November VoIP News Update

https://youtu.be/a--L6ZF9iAw VoIP Supply’s November VoIP News Update: Exciting New Tools, Upcoming Releases, and Giving Back…

1 week ago

Q&A: Wi-Fi 6 vs. Wi-Fi 5: What’s the Real Difference for Everyday Users?

Wireless internet? I remember sharing computer time with my siblings to wait 10 minutes for…

1 week ago

Fanvil FCMS Smart Proporty Solutions Webinar | November 2024

https://youtu.be/0Oxom_f47EE If you missed this webinar, then don't worry, the recording has arrived! This webinar…

2 weeks ago

How To: Extend Your DECT Range for Wireless VoIP Phones – Tips for Large Office Spaces

Ensuring seamless VoIP connectivity across vast areas can be challenging if you're managing a large…

2 weeks ago