Asterisk Project : Function_CHANNEL This page last changed on Apr 20, 2011 by wikibot. # CHANNEL() ### Synopsis Gets/sets various pieces of information about the channel. ### Description Gets/sets various pieces of information about the channel, additional item may be available from the channel driver; see its documentation for details. Any item requested that is not available on the current channel will return an empty string. ### Syntax
    CHANNEL(item)
##### Arguments `item` - Standard items (provided by all channel technologies) are: chan_sip provides the following additional options: chan_iax2 provides the following additional options: chan_dahdi provides the following additional options: `audioreadformat` - R/O format currently being read. `audionativeformat` - R/O format used natively for audio. `audiowriteformat` - R/O format currently being written. `callgroup` - R/W call groups for call pickup. `channeltype` - R/O technology used for channel. `checkhangup` - R/O Whether the channel is hanging up (1/0) `language` - R/W language for sounds played. `musicclass` - R/W class (from musiconhold.conf) for hold music. `name` - The name of the channel `parkinglot` - R/W parkinglot for parking. `rxgain` - R/W set rxgain level on channel drivers that support it. `secure_bridge_signaling` - Whether or not channels bridged to this channel require secure signaling `secure_bridge_media` - Whether or not channels bridged to this channel require secure media `state` - R/O state for channel `tonezone` - R/W zone for indications played `transfercapability` - R/W ISDN Transfer Capability, one of: `SPEECH` `DIGITAL` `RESTRICTED_DIGITAL` `3K1AUDIO` `DIGITAL_W_TONES` `VIDEO` `txgain` - R/W set txgain level on channel drivers that support it. `videonativeformat` - R/O format used natively for video `trace` - R/W whether or not context tracing is enabled, only available if CHANNEL_TRACE is defined. `peerip` - R/O Get the IP address of the peer. `recvip` - R/O Get the source IP address of the peer. `from` - R/O Get the URI from the From: header. `uri` - R/O Get the URI from the Contact: header. `useragent` - R/O Get the useragent. `peername` - R/O Get the name of the peer. `t38passthrough` - R/O `1` if T38 is offered or enabled in this channel, otherwise `0` `rtpqos` - R/O Get QOS information about the RTP stream This option takes two additional arguments: Argument 1: `audio` Get data about the audio stream `video` Get data about the video stream `text` Get data about the text stream Argument 2: `local_ssrc` Local SSRC (stream ID) `local_lostpackets` Local lost packets `local_jitter` Local calculated jitter `local_maxjitter` Local calculated jitter (maximum) `local_minjitter` Local calculated jitter (minimum) `local_normdevjitter` Local calculated jitter (normal deviation) `local_stdevjitter` Local calculated jitter (standard deviation) `local_count` Number of received packets `remote_ssrc` Remote SSRC (stream ID) `remote_lostpackets` Remote lost packets `remote_jitter` Remote reported jitter `remote_maxjitter` Remote calculated jitter (maximum) `remote_minjitter` Remote calculated jitter (minimum) `remote_normdevjitter` Remote calculated jitter (normal deviation) `remote_stdevjitter` Remote calculated jitter (standard deviation) `remote_count` Number of transmitted packets `rtt` Round trip time `maxrtt` Round trip time (maximum) `minrtt` Round trip time (minimum) `normdevrtt` Round trip time (normal deviation) `stdevrtt` Round trip time (standard deviation) `all` All statistics (in a form suited to logging, but not for parsing) `rtpdest` - R/O Get remote RTP destination information. This option takes one additional argument: Argument 1: `audio` Get audio destination `video` Get video destination `text` Get text destination `dahdi_channel` - R/O DAHDI channel related to this channel. `dahdi_span` - R/O DAHDI span related to this channel. `dahdi_type` - R/O DAHDI channel type, one of: `analog` `mfc/r2` `pri` `pseudo` `ss7` `keypad_digits` - R/O PRI Keypad digits that came in with the SETUP message. `reversecharge` - R/O PRI Reverse Charging Indication, one of: `-1` - None {{ 1}} - Reverse Charging Requested `no_media_path` - R/O PRI Nonzero if the channel has no B channel. The channel is either on hold or a call waiting call. ### See Also ### Import Version This documentation was imported from Asterisk version SVN-branch-1.8-r314358.

Document generated by Confluence on Oct 04, 2011 12:42