August 2007
Intermediate to advanced
608 pages
20h 33m
English
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Name
CHANNEL — Gets or sets various channel parameters
Synopsis
CHANNEL(item)
Standard items (provided by all channel technologies) are:
audioreadformatRead-only. Format currently being read.
audionativeformatRead-only. Format used natively for audio.
videonativeformatRead-only. Format used natively for video.
audiowriteformatRead-only. Format currently being written.
callgroupRead/write. Callgroups for call pickup.
channeltypeRead-only. Technology used for channel.
languageRead/write. Language used for sounds played and recorded.
musicclassRead/write. Class used (from musiconhold.conf) for hold music.
rxgainRead/write. Receive gain (in dB) on channel drivers that support it.
txgainRead/write. Transmit gain (in dB) on channel drivers that support it.
tonezoneRead/write. Regional zone for indications played.
stateRead-only. Current channel state.
transfercapabilityRead/write. What can be transferred on an ISDN circuit. Current valid values are:
SPEECHSpeech (default, voice calls)
DIGITALUnrestricted digital information (data calls)
RESTRICTED_DIGITALRestricted digital information
3K1AUDIO3.1 kHz Audio (fax calls)
DIGITAL_W_TONESUnrestricted digital information with tones/announcements
VIDEOVideo
Additional items may be available from the channel driver providing the channel; see its documentation for details. Any item requested that is not available on the current channel will return an empty string.
See Also
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.