September 2005
Intermediate to advanced
408 pages
16h 20m
English
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Name
Echo() — Echoes inbound audio back to the caller
Synopsis
Echo()
Echoes audio read from the channel back to the channel. This
application is often used to test the latency and voice quality of a
VoIP link. The caller may press the # key to exit.
Returns 0 if the user exits
with the # key, or -1 if the user hangs up.
exten => 123,1,Echo()
exten => 123,2,Playback(vm-goodbye)See Also
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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.