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Test this out. Listen to it count for a while, and then hang up. When you dial this
extension again, it will continue counting from where it left off. The value stored in
the database will be persistent, even across a restart of Asterisk.
In the early days of Asterisk, the built-in database was essential. Today, however, it’s
not as commonly used. It’s probably good for setting a few semaphores here and
there, but for the most part, if you want to store data, use one of the relational data‐
base backends (we discuss relational database integration in later chapters).
Handy Asterisk Features
Now that we’ve gone over some more of the basics, let’s look at a few popular func‐
tions that have been incorporated into Asterisk.
Conferencing with ConfBridge()
The ConfBridge() application allows multiple callers to converse together, as if they
were all in the same physical location. Some of the main features include:
• The ability to create password-protected conferences
• Conference administration (mute conference, lock conference, or kick off
participants)
• The option of muting all but one participant (useful for company announce‐
ments, broadcasts, etc.)
• Static or dynamic conference creation
• High-definition audio that can be mixed at sample rates ranging from 8 kHz to
96 kHz
Handy Asterisk Features
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• Video capabilities, including the addition of dynamically switching video feeds
based on loudest talker
• Dynamically controlled menu system for both conference administrators and
users
• Additional options available in the confbridge.conf configuration file
In this chapter we are focused on the dialplan, so we’re only going to demonstrate a
basic audio conference bridge:
$ sudo -u asterisk vim /etc/asterisk/confbridge.conf
[general]
[default_user]
type=user
[default_bridge]
type=bridge
After building the confbridge.conf file, we need to load the app_confbridge.so mod‐
ule. This can be done at the Asterisk console:
*CLI> module load app_confbridge.so
With the module loaded, we can build a simple dialplan to access our conference
bridge:
exten => 221,1,NoOp()
same => n,ConfBridge(${EXTEN})
This is just the tip of the iceberg for conferencing. We’ve got the base configuration
done, but there is much more functionality to be configured. We’ll cover it in a little
more detail in Chapter 11.
Handy Dialplan Functions
We discussed functions earlier in this chapter, but there’s more to say. There are cur‐
rently around 150 dialplan functions provided by the Asterisk dialplan. Here is a
small, curated list of a few worth experimenting with.
CALLERID()
CALLERID() supports many different datatypes, but you’ll find that you’ll typically use
one of name or num.
exten => 222,1,Noop(CALLERID function)
same => n,Noop(CALLERID currently ${CALLERID(all)})
same => n,Set(CALLERID(num)=4169671111)
same => n,Noop(CALLERID now ${CALLERID(all)})
same => n,Set(CALLERID(name)="Somename")
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Chapter 10: Deeper into the Dialplan
same => n,Noop(CALLERID now ${CALLERID(all)})
same => n,Hangup()