Asterisk: The Future of Telephony, 2nd Edition

Name

CHANNEL — Gets or sets various channel parameters

Synopsis

CHANNEL(item)

Standard items (provided by all channel technologies) are:

audioreadformat

Read-only. Format currently being read.

audionativeformat

Read-only. Format used natively for audio.

videonativeformat

Read-only. Format used natively for video.

audiowriteformat

Read-only. Format currently being written.

callgroup

Read/write. Callgroups for call pickup.

channeltype

Read-only. Technology used for channel.

language

Read/write. Language used for sounds played and recorded.

musicclass

Read/write. Class used (from musiconhold.conf) for hold music.

rxgain

Read/write. Receive gain (in dB) on channel drivers that support it.

txgain

Read/write. Transmit gain (in dB) on channel drivers that support it.

tonezone

Read/write. Regional zone for indications played.

state

Read-only. Current channel state.

transfercapability

Read/write. What can be transferred on an ISDN circuit. Current valid values are:

SPEECH

Speech (default, voice calls)

DIGITAL

Unrestricted digital information (data calls)

RESTRICTED_DIGITAL

Restricted digital information

3K1AUDIO

3.1 kHz Audio (fax calls)

DIGITAL_W_TONES

Unrestricted digital information with tones/announcements

VIDEO

Video

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

CDR()