Background() — Plays a file while accepting touch-tone (DTMF) digits
Plays the specified audio file(s) while waiting for the
user to begin entering DTMF digits. Once the user begins to enter DTMF
digits, the playback is terminated. Asterisk tries to find a matching
extension in the destination context (or the
current context if none is specified), and execution of the dialplan
will continue at the matching extension as soon as an unambiguous match
is found.
The filename should be specified
without a file extension, as Asterisk will automatically find the file
format with the lowest translation cost.
Valid options include one of the
following:
s
Causes the playback of the message to be skipped if the
channel is not in the “up” state (i.e., hasn’t yet been answered).
If s is specified, the
application will return immediately should the channel not be
off-hook.
n
Does not answer the channel before playing the specified file. Without this option, the channel will automatically be answered before the sound is played. Not all channels support playing messages before being answered.
m
Only break if a digit hit matches a one-digit extension in the destination context.
The language argument may be used to
specify a language to use for playing the prompt, if it differs from the
current language of the channel.
exten => 123,1,Answer()
exten => 123,2,Background('exter-ext-of-person');