June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Asterisk Channels
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411
WaitMusicOnHold
WaitMusicOnHold(seconds)
Identical to Wait( ), but plays the music-on-hold class associated with this call or
context while the caller is waiting.
Zapateller
Zapateller( )
Sends the do-not-call signal to incoming callers.
ZapBarge
ZapBarge(channel)
Allows caller to clandestinely listen in on another channel’s call in progress, as long
as it’s a Zaptel channel. Neither party in the conversation will know that the call is
being monitored by the “barging” caller. If you don’t provide a channel name, the
caller will be prompted for one. Entering 1# would listen in on Zap/1, while enter-
ing 3# would listen in on Zap/3.
ZapScan
ZapScan( )
Scans Zaptel channels to monitor calls. Pressing # moves to the next channel. Press-
ing the star key (
*) exits to the next priority.
Asterisk Channels
While extensions.conf is the main place Asterisk’s dial-plan is configured, other files
are needed to set up the VoIP and TDM interfacing necessary to allow the Asterisk
server to communicate with the outside world. These files include zapata.conf,
zaptel.conf, and sip.conf.
Zaptel Channels
Digium’s Wildcard interface cards enable legacy channels so Asterisk can communi-
cate using T1s and analog phones or POTS lines. Chapter 3 describe how to obtain
and install Asterisk with
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.