Enterprise Voice Over IP | Introduction to VoIP (Part 2)
This video builds on the smaller voice network from the last video, and takes a look at what a larger deployment might look like.
A larger network might have several of each core component. This includes several PBX’s and several SIP trunks. But in addition to this, they might have video phones, fax servers, voice gateways (for PSTN and ISDN), a Session Border Controller (SBC), and voice capture server.
Voice gateways integrate the modern digital network with old telephone equipment like copper PSTN lines. Essentially, it translates (transcodes) between digital and analogue using a DSP module. The PBX can control it using the Media Control Gateway Protocol (MCGP).
The Session Border Controller (SBC) is similar to a gateway, but is entirely digital (uses SIP trunks). It is like a firewall for voice in some ways, as it typically goes on the edge of your network, applies security policy, and translates between different voice codecs. It’s also called a Back-to-Back-User-Agent (B2BUA) as it maintains a call on the outside and inside of the network.
Call security is a major part of the SBC’s job. It can encrypt traffic, prevent toll fraud, and route calls down particular links.
In addition, it can translate between different call types (for example, between SIP and H.323), as well as transcode between different codecs.
Overview of this video:
0:00 Introduction
0:12 A Larger Topology
2:20 Voice Gateways
4:23 Session Border Controllers
8:44 Call Security
9:42 Interworking
Patreon information: https://networkdirection.net/patreon/
Further Reading:
What is a Session Border Controller?
https://www.mitel.com/en-au/features-...
CUBE Configuration Guide
https://www.cisco.com/c/en/us/td/docs...
Best Practice to Reduce the Risk of Toll Fraud
https://www.vocus.com.au/news/best-pr...
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