[incoming]
exten => _.,1,NoOp()
    same = n,Verbose(Inbound call to ${EXTEN} detected)
    same = n,Set(DIALGROUP(incoming,add)=PJSIP/100)
    same = n,Set(DIALGROUP(incoming,add)=PJSIP/101)
    same = n,Set(DIALGROUP(incoming,add)=PJSIP/102)
    same = n,Dial(${DIALGROUP(incoming)},15)
    same = n,Set(MAILBOXES=${PJSIP_ENDPOINT(pstn,mailboxes)})
    same = n,ExecIf($[${LEN(${MAILBOXES})} = 0]?Congestion(10))
    same = n,Voicemail(${MAILBOXES},uS)
    same = n,Playback(vm-goodbye)
    same = n,Hangup()

[from-internal]

; Emergency outbound dialing
exten => 911,1,NoOp()
    same = n,Goto(dialout,${EXTEN},1)

; Emergency test outbound dialing
; (Doesn't seem to be supported on Verizon FiOS)
exten => 933,1,NoOp()
    same = n,Goto(dialout,${EXTEN},1)

; 7+ digit calls are routed outside via the PSTN
exten => _NXXXXXX.,1,NoOp()
    same = n,Goto(dialout,${EXTEN},1)

exten => _1NXXXXXX.,1,NoOp()
    same = n,Goto(dialout,${EXTEN},1)

; Landline-related extensions
exten => 436,1,NoOp()
    same = n,Verbose(Testing inbound calling?)
    same = n,Goto(incoming,${EXTEN},1)

exten => *436,1,Answer()
    same = n,Wait(1)
    same = n,VoicemailMain(436@sailmaker,s)
    same = n,Hangup()

; Dummy extensions
exten => 700,1,Answer()
    same = n,Wait(1)
    same = n,Playback(hello-world)
    same = n,Wait(1)
    same = n,Playback(tt-monkeys)
    same = n,Hangup()

; Other extensions
3-digit extensions dial their associated devices
exten => _XXX,1,Dial(PJSIP/${EXTEN}, 15)
    same = n,Set(MAILBOXES=${PJSIP_ENDPOINT(${EXTEN},mailboxes)})
    same = n,ExecIf($[${LEN(${MAILBOXES})} = 0]?Congestion(10))
    same = n,Voicemail(${MAILBOXES})
    same = n,Playback(vm-goodbye)
    same = n,Hangup()

; Star plus 3-digit extensions dial their associated mailboxes
exten => _*XXX,1,Answer()
    same = n,Wait(1)
    same = n,VoiceMailMain(${EXTEN:1}@sailmaker)
    same = n,Hangup()

;  3-digit extensions plus star go directly to voicemail
exten => _XXX*,1,Answer()
    same = n,Wait(1)
    same = n,Voicemail(${EXTEN:0:-1}@sailmaker,u)
    same = n,Hangup()

[dialout]
exten => _X!,1,NoOp()
    same = n,Verbose(Dialing out to ${EXTEN})
    same = n,Dial(PJSIP/${EXTEN}@pstn)
    same = n,Hangup()