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sig_analog: Add Call Waiting Deluxe support.

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Adds support for Call Waiting Deluxe options to enhance
the current call waiting feature.

As part of this change, a mechanism is also added that
allows a channel driver to queue an audio file for Dial()
to play, which is necessary for the announcement function.

ASTERISK-30373 #close

Resolves: #271

UserNote: Call Waiting Deluxe can now be enabled for FXS channels
by enabling its corresponding option.

(cherry picked from commit 876c25a953)
This commit is contained in:
Naveen Albert
2023-08-24 14:07:06 +00:00
committed by George Joseph
parent 07fd8b5ad3
commit ccdcc18dec
10 changed files with 294 additions and 0 deletions
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25
configs/samples/chan_dahdi.conf.sample
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@@ -684,6 +684,31 @@ usecallerid=yes
;
callwaiting=yes
;
; Whether or not to allow for Call Waiting Deluxe options to be used.
; The Call Waiting Deluxe options are:
; 3: Conference - conference the call waiting call with the existing call
; 7: Drop - drop current call and switch to new (same as hanging up and answering)
; 6/8: Announcement - play announcement to call waiting caller telling them to hold
; 9: Forward - forward the call waiting call to a preconfigured extension
; Doing nothing after 1 second triggers default behavior of holding the current call
; and switching to the new one.
;
; Some CPE (Caller ID units, screenphones, etc.) have dedicated buttons for utilizing
; the Call Waiting Deluxe features, but these can also be used from any phone manually
; by simply hook flashing as usual and then quickly dialing the appropriate DTMF digit.
; If no digit is received within 1 second, the default action is assumed,
; as if Call Waiting Deluxe was not used.
;
; The following extensions are also available in the dialplan to utilize this functionality:
; - The CALLWAITDELUXEANNOUNCEMENT variable can be set on the incoming channel to control the
; announcement prompt played to the call waiting caller. Default is "one-moment-please".
; - If the forward option is used, the call waiting channel will be forwarded to the 'f' extension
; in the channel's configured context. You can then use any dialplan mechanism to route the call.
;
; Default is 'no'.
;
;callwaitingdeluxe=yes
;
; Configure the number of outstanding call waiting calls for internal ISDN
; endpoints before bouncing the calls as busy. This option is equivalent to
; the callwaiting option for analog ports.