For a list of all the ways technology has failed to improve the quality of life, please press three.
Alrighty. You’ve got the basics of dialplans down, but you know there’s more to come. If you don’t have Chapter 6 sorted out yet, please go back and give it another read. We’re about to get into more advanced topics.
As we begin our dive into the deeper aspects of dialplans, it is time to introduce you to a few tools that will greatly add to the power you can exercise in your dialplan. These constructs add incredible intelligence to your dialplan by enabling it to make decisions based on different criteria you define. Put on your thinking cap, and let’s get started.
Throughout this chapter we use best practices
that have been developed over the years in dialplan creation. The
primary one you’ll notice is that all the first priorities start with
NoOp() application, which simply
means No Operation; nothing functional will happen. The other one is
that all following lines will start with
=> n, which is a shortcut that says, “Use the same
extension as was just previously defined.” Additionally, the indentation
is four spaces.
Expressions are combinations of variables, operators, and
values that you string together to produce a result. An expression can
test values, alter strings, or perform mathematical calculations. Let’s
say we have a variable called
COUNT. In plain English, ...