Custom feature codes to read back the feature status of extensions

This code can be dropped into extensions_custom.conf and will read
back to the caller the status of various features on the caller's
extension (if *108 is dialed) or on any specified extension (if
*109+extension is dialed - if you only dial *109 you are prompted to
enter the extension). See the comments in the code for additional
details. This code was originally created by philippel (a.k.a.
p_lindheimer), and modified slightly to add Call Forward On Unavailable
/ No Answer. Also, the invocation feature codes were changed to *108
and *109 - if you want to change them to *+ a 2 digit code, be sure to
change the {EXTEN:4} back to {EXTEN:3} in the two places it appears (in
the *109 section below).

Addendum: This code calls a file:
/var/lib/asterisk/sounds/custom/quarter-second-silence.wav which is
simply one-quarter second of silence in a .wav format file (8000 Hz, 16
bit, mono format). If you don't have this file and don't wish to create
it, search and replace all instances of custom/quarter-second-silence with silence/1

Also, the code has been modified since the original posting to
combine consecutive multiple Playback statements into single
statements.

;-------------------------------------------------------------------------------------------
; REPORT BACK ON EXTENSION STATUS
;
; Settings Currently Supported:
; CW: Call Waiting
; DND: Do Not Disturb
; CFB: Call Forward On Busy
; CFU: Call Forward On Unavailable / No Answer
; CF: Call Forward Unconditional
;
; get status of a specific extentsion by dialing *109xxx where xxx is the extension
; status is desired for. (Can be any number of supported extension digits)
exten => _*109.,1,Set(uext=${EXTEN:4})
exten => _*109.,n,Noop(STATUS ON EXTENSION: ${EXTEN:4})
exten => _*109.,n,Answer
exten => _*109.,n,Wait(1)
exten => _*109.,n,Goto(custom-check-status,s,1)
; get status from specific extension, prompted after dialing
exten => *109,1,Answer
exten => *109,n,Wait(1)
exten => *109,n,BackGround(please-enter-the)
exten => *109,n,Playback(extension)
exten => *109,n,Read(uext,then-press-pound)
exten => *109,n,Wait(1)
exten => *109,n,Goto(custom-check-status,s,1)
; playback extension settings for current or prompted phone
exten => *108,1,Answer
exten => *108,n,Set(uext=${CALLERIDNUM})
exten => *108,n,Goto(custom-check-status,s,1)
; this function is passed an extension number and will read back the
; status on the target extension
;
; TARGET EXTENSION ${uext}
;
; Settings Currently Supported:
; CW: Call Waiting
; DND: Do Not Disturb
; CFB: Call Forward On Busy
; CFU: Call Forward On Unavailable / No Answer
; CF: Call Forward Unconditional
[custom-check-status]
; Announce Extension Being Reported on
exten => s,1,Noop(REPORTING STATUS ON EXT: ${uext})
exten => s,n,Playback(status&for&extension)
exten => s,n,SayDigits(${uext})
exten => s,n,Playback(is)
; CW: Call Waiting Status
exten => s,n,Noop(CW RESULTS: ${DB_EXISTS(CW/${uext})} : ${DB_RESULT})
exten => s,n,Playback(custom/quarter-second-silence&call-waiting)
exten => s,n,GotoIf($[${DB_EXISTS(CW/${uext})}]?cwenabled:cwdisabled)
exten => s,n(cwenabled),Playback(activated)
exten => s,n,Goto(dndcheck)
exten => s,n(cwdisabled),Playback(de-activated)
; DND: Do Not Disturb Status
exten => s,n(dndcheck),Noop(DND RESULTS: ${DB_EXISTS(DND/${uext})} : ${DB_RESULT})
exten => s,n,Playback(custom/quarter-second-silence&do-not-disturb)
exten => s,n,GotoIf($[${DB_EXISTS(DND/${uext})}]?dndenabled:dnddisabled)
exten => s,n(dndenabled),Playback(activated)
exten => s,n,Goto(cfbcheck)
exten => s,n(dnddisabled),Playback(de-activated)
; CFB: Call Forward on Busy Status
exten => s,n(cfbcheck),Noop(CFB RESULTS: ${DB_EXISTS(CFB/${uext})} : ${DB_RESULT})
exten => s,n,Playback(custom/quarter-second-silence&call-fwd-on-busy)
exten => s,n,GotoIf($[${DB_EXISTS(CFB/${uext})}]?cfbenabled:cfbdisabled)
exten => s,n(cfbenabled),Playback(activated&and&is-set-to)
exten => s,n,SayDigits(${DB_RESULT})
exten => s,n,Goto(cfucheck)
exten => s,n(cfbdisabled),Playback(de-activated)
; CFU: Call Forward on Unavailable Status
exten => s,n(cfucheck),Noop(CFU RESULTS: ${DB_EXISTS(CFU/${uext})} : ${DB_RESULT})
exten => s,n,Playback(custom/quarter-second-silence&call-fwd-no-ans)
exten => s,n,GotoIf($[${DB_EXISTS(CFU/${uext})}]?cfuenabled:cfudisabled)
exten => s,n(cfuenabled),Playback(activated&and&is-set-to)
exten => s,n,SayDigits(${DB_RESULT})
exten => s,n,Goto(cfcheck)
exten => s,n(cfudisabled),Playback(de-activated)
; CF: Call Forward Unconditional Status
exten => s,n(cfcheck),Noop(CF RESULTS: ${DB_EXISTS(CF/${uext})} : ${DB_RESULT})
exten => s,n,Playback(custom/quarter-second-silence&call-fwd-unconditional)
exten => s,n,GotoIf($[${DB_EXISTS(CF/${uext})}]?cfenabled:cfdisabled)
exten => s,n(cfenabled),Playback(activated&and&is-set-to)
exten => s,n,SayDigits(${DB_RESULT})
exten => s,n,Goto(endcheck)
exten => s,n(cfdisabled),Playback(de-activated)
; CALL STATUS END - GOODBYE!
exten => s,n,Playback(custom/quarter-second-silence&goodbye)
exten => s,n,Hangup
;------