To set the stage for our explanation of include statements, let's say that we want to organize our dialplan and create a new context called [docs:features]. We'll leave our extensions 6001 and 6002 for Alice and Bob in the [docs:users] context, and place extensions such as 6500 in the new [docs:features] context. When calls come into the users context and doesn't find a matching extension, the include statement tells Asterisk to also look in the new [docs:features] context.
The syntax for an include statement is very simple. You simply write include => and then the name of the context you'd like to include from the existing context. If we reorganize our dialplan to add a [docs:features] context, it might look something like this: