What you will learn:
You'll learn the end-to-end process of making a telephone call: signalling, routing, resource allocation, call control, and billing - understanding the role each plays in delivering a reliable voice connection. The course explains the differences between circuit-switched and VoIP telephony architectures, and the factors that determine call quality. You will also learn how calls are routed over telephony systems and the factors that influence routing decisions.
By the end of this course you will be able to:
- describe the role of the processes involved in making a telephone call including signalling, routing, resource allocation, call control, and billing.
- explain the functions of signalling including setting up and releasing transmission resources, sending address information and capability negotiation.
- describe the need for, and role of, authentication, authorisation and accounting.
- compare the structure, components, and operation of telephony systems using circuit switching with those employing voice over IP techniques.
- describe the factors that affect the quality of service (QofS) provided for telephone calls and measures taken to maximise QofS.
- describe the format of numbering conforming to the E.164 standard, its relationship to the routing of calls and the allocation of number ranges.
- describe the call routing processes and functional components involved in routing calls including those involving special services, call forwarding, emergency calls, and those to ported numbers.
- describe the role of inbound routing giving examples of its use.
- describe the role of outbound routing with reference to voice polices, PSTN usage records, emergency routes, and least cost routing.
- describe the measures taken to maximise the availability of a telephony service.
- explain the factors that determine the required grade of service provided by a telephony system.
Course prerequisites:
An understanding of the basic principles of data communications. It is recommended that the PTT course "Data communications principles" is studied in preparation for this course.
Approximate study time: 5 hours
Delivery platform requirements:
To access the course, a computer/tablet running a browser such as Chrome, Safari, Edge etc. is required. The device should have an active Internet connection and a screen resolution of at least 1024x768.