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Teracom Tutorial: VoIP

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Teracom Tutorial: VoIP: The Big Picture
1.03 The Big Picture
This lesson is the beginning of Course 130, Voice over IP, SIP, Security, 5G and the Internet of Everything . It is used to preview the entire course, and illustrates VoIP components and technologies and how they are organized.
The key components are detailed in the following lessons in the course: discussions of who, why, what, how, where and when takes two days.
To begin Voice over IP, SIP, Security, 5G and the Internet of Everything , we start with the top-level system architecture and principal components of an IP telecommunications network.
At the heart of the diagram is one or more IP networks, essentially high-capacity circuits connecting IP routers, to which users are provided access.
Access for residential customers is and will be for some time to come via modems on copper wires – either DSL or Cable TV (CATV) modems. In the future, Passive Optical Networks and active Optical Ethernet may be deployed for higher-bandwidth residential access. Fiber will be more common for government and business access, using IEEE 802.3 Ethernet over fiber standards for the access circuit.
A customer-premise "adapter" device is used to implement the link and network (Layer 2 and 3) protocols required to connect to the IP network, call setup using the SIP protocol, and to digitize and packetize voice from analog telephones.
Devices will be connected within the building using Layer 2 (LAN) switches, and a customer-premise router will act as a point of control for traffic between the customer's in-building network and the IP telecommunications network.
The principal components required for Voice over IP are terminals, soft switches, media servers and gateways. These are detailed on the following pages in the course.
 
Source: Teracom Course 130, Voice over IP, SIP, Security, 5G and the Internet of Everything , slide 1.03
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