asterisk/configs/basic-pbx/extensions.conf

[globals]
; General internal dialing options used in context Dial-Users.
; Only the timeout is defined here. See the Dial app documentation for
; additional options.
INTERNAL_DIAL_OPT=,30

[Hints]
; Allow dynamic hint creation for every extension.
exten = _11XX,hint,PJSIP/${EXTEN}

[Features]
; Extension to check user voicemail. We don't requre the user to enter
; their pincode.
exten = 8000,1,Verbose(1, "User ${CALLERID(num)} dialed the voicemail feature.")
 same = n,VoiceMailMain(${CALLERID(num)}@example,s)
 same = n,Hangup()

; Exten to dial the main IVR internally.
exten = 1100,1,Verbose(1, "User ${CALLERID(num)} dialed the IVR.")
 same = n,Goto(Main-IVR,2565551100,1)

;Extension to enter a conference intended only for employees
exten = 6000,1,Verbose(1, "User ${CALLERID(num)} dialed the employee conference.")
 same = n,Confbridge(employees)
 same = n,Hangup()

;Extension to enter a conference intended for employees and customers
exten = 6500,1,Verbose(1, "User ${CALLERID(num)} dialed the employee/customer mixed conference.")
 same = n,Confbridge(mixed)
 same = n,Hangup()

[External-Features]
; Extension for users to remotely check voicemail. Here we require the caller to
; enter their mailbox and pincode.
exten = 2565551234,1,Verbose(1, "User ${CALLERID(num)} dialed into remote voicemail.")
 same = n,VoiceMailMain(example)
 same = n,Hangup()

[Dialing-Errors]
; Handle any extensions dialed internally that don't otherwise exist.
; Comment out or remove this extension if you would rather have the calls
; ignored.
exten = _X.,1,Verbose(1, "User ${CALLERID(num)} dialed an invalid number.")
 same = n,Playback(pbx-invalid)
 same = n,Hangup()

[Internal-Setup]
; Here we capture internal calls to do anything we need to do before sending
; them onto all the possible internal locations. Such as disabling CDR on
; internal to internal calls.
exten = _X.,1,NoOp()
 same = n,Set(CDR_PROP(disable)=1)
 same = n,Goto(Internal-Main,${EXTEN},1)

; The Internal-Main context provides a way for internal callers to get access to most
; features and functions configured for them. External callers may be sent
; directly to some of the contexts you see included here, so the included
; contexts are not necessarily internal only.
[Internal-Main]
; The order of includes here is important for matching the right extensions.
include = Hints
include = Features
include = Dial-Users
include = Dialing-Errors

; Dial-Users handles calls to internal extensions.
; Calls coming into this context may be *external* or *internal* in origin.
[Dial-Users]
exten = _11XX,1,Verbose(1, "User ${CALLERID(num)} dialed ${EXTEN}.")
 same = n,Set(SAC_DIALED_EXTEN=${EXTEN})
 same = n,Gotoif($[${DEVICE_STATE(PJSIP/${EXTEN})} = BUSY]?dialed-BUSY,1:)
 same = n,Dial(PJSIP/${EXTEN}${INTERNAL_DIAL_OPT})
 same = n,Goto(dialed-${DIALSTATUS},1)

exten = dialed-NOANSWER,1,NoOp()
 same = n,Voicemail(${SAC_DIALED_EXTEN}@example,u)
 same = n,Hangup()

exten = dialed-BUSY,1,NoOp()
 same = n,Voicemail(${SAC_DIALED_EXTEN}@example,b)
 same = n,Hangup()

exten = dialed-CHANUNAVAIL,1,NoOp()
 same = n,Playback(pbx-invalid)
 same = n,Hangup()

exten = _dialed-.,1,Goto(dialed-NOANSWER,1)

exten = h,1,Hangup()

; Callers in the directory may dial 0 which will jump to the
; 'o' extension.
exten = o,1,Goto(1111)

; Outbound-Dial
;
; Before we dial, see if the extension matches our restricted number patterns.
; Note that this is a basic set of numbers which could incur a fee if dialed.
; The NANP includes many other numbers that you may want to block. If you feel
; it is necessary to block further number patterns you'll have to add them below
; or you may consider implementing a blacklist via methods beyond the scope of
; this example.
[Outbound-Dial]
exten = _011.,1,Hangup()
exten = _900NXXXXXX,1,Hangup()
exten = _1900NXXXXXX,1,Hangup()
exten = _976XXXX,1,Hangup()
exten = _NXX976XXXX,1,Hangup()
exten = _1NXX976XXXX,1,Hangup()
; Dial outbound through our SIP ITSP.
exten = _X.,1,Verbose(1, "Didn't match any restricted numbers, proceeding with outbound dial.")
 same = n,Set(CALLERID(num)=256555${CALLERID(num)})
 same = n,Dial(PJSIP/${EXTEN}@dcs-endpoint)
 same = n,Hangup()

; Calls from internal endpoints will enter into one of the two following
; contexts based on their dialing privilege.
[Local]
include = Internal-Setup

exten = _NXXXXXX,1,Goto(Outbound-Dial,1256${EXTEN},1)
exten = _256NXXXXXX,1,Goto(Outbound-Dial,1${EXTEN},1)
exten = _1256NXXXXXX,1,Goto(Outbound-Dial,${EXTEN},1)

[Long-Distance]
include = Local

exten = _NXXNXXXXXX,1,Goto(Outbound-Dial,1${EXTEN},1)
exten = _1NXXNXXXXXX,1,Goto(Outbound-Dial,${EXTEN},1)

; The DID-Extensions context captures inbound calls from our ITSP that have a
; DID number where the last four digits matches an internal extension.
[DID-Extensions]
exten = _25655511XX,1,Verbose(1, "External caller dialed inbound to DID ${EXTEN})")
 same = n,Goto(Dial-Users,${EXTEN:6},1)

; Our main IVR program for receiving inbound callers.
; The IVR script reads “Thank you for calling Super Awesome Company, Waldo’s
; premier provider of perfect products. If you know your party’s extension,
; you may dial it at any time. To establish a sales partnership, press one. To
; speak with a customer advocate, press two. For accounting and other
; receivables, press three. For a company directory, press four. For an
; operator, press zero.”
; demo-congrats is currently used as a placeholder.
[Main-IVR]
exten = 2565551100,1,Verbose(1, "New caller, ${CALLERID(num)} dialed into the IVR.")
 same = n,Answer()
 same = n(start),Background(demo-congrats)
 same = n,WaitExten(10)
 same = n,Background(demo-congrats)
 same = n,Hangup()

exten = 0,1,Verbose(1, "Caller ${CALLERID(num)} dialed the operator.")
 same = n,Goto(Dial-Users,1111,1)
exten = 1,1,Verbose(1, "Caller ${CALLERID(num)} dialed the Sales queue.")
 same = n,Goto(External-Features,2565551200,1)
exten = 2,1,Verbose(1, "Caller ${CALLERID(num)} dialed the Customer Experience queue.")
 same = n,Goto(External-Features,2565551250,1)
exten = 3,1,Verbose(1, "Caller ${CALLERID(num)} dialed Accounting and Receivables.")
 same = n,Goto(Dial-Users,1106,1)
exten = 4,1,Verbose(1, "Caller ${CALLERID(num)} dialed the directory.")
 same = n,Directory(example,Dial-Users)

exten = i,1,Playback(option-is-invalid)
 same = n,Goto(2565551100,start)

exten = t,1,Playback(are-you-still-there)
 same = n,Goto(2565551100,start)

; Calls from our ITSP SIP account arrive in DCS-Incoming. We should be careful
; to route calls very explicitly so as to avoid any security issues, such as
; accidentally giving outbound dial access to inbound callers.
;
; Each context includes extension pattern matching to match the inbound DID
; dialed appropriately.
[DCS-Incoming]
include = Main-IVR
include = DID-Extensions
include = External-Features