Page 581 - Asterisk™: The Future of Telephony

exten => i,1,NoOp()
exten => i,n,Playback(silence/2&sorry-cant-let-you-do-that2)
exten => i,n,Hangup()
include => longdistance

[longdistance]
exten => _1NXXNXXXXXX,1,NoOp()
exten => _1NXXNXXXXXX,n,Set(E=${EXTEN})
exten => _1NXXNXXXXXX,n,Goto(outgoing,call,1)
exten => _NXXNXXXXXX,1,Goto(1${EXTEN},1)

exten => i,1,NoOp()
exten => i,n,Playback(silence/2&sorry-cant-let-you-do-that2)
exten => i,n,Hangup()

include => local
[local]
exten => _416NXXXXXX,1,NoOp()
exten => _416NXXXXXX,n,Set(E=${EXTEN})
exten => _416NXXXXXX,n,Goto(outgoing,call,1)
exten => i,1,NoOp()
exten => i,n,Playback(silence/2&sorry-cant-let-you-do-that2)
exten => i,n,Hangup()

[outgoing]
exten => call,1,NoOp()
exten => call,n,Set(CALLERID(name)=${${WHO}_CID_NAME})
exten => call,n,Set(CALLERID(number)=${${WHO}_CID_NUMBER})
exten => call,n,Dial(SIP/service_provider/${E})
exten => call,n,Playback(silence/2&pls-try-call-later)
exten => call,n,Hangup()

[hotdesk_phones]
exten => _11XX,1,NoOp()
exten => _11XX,n,Set(E=${EXTEN})
exten => _11XX,n,Set(LOCATION=${HOTDESK_LOCATION(${E})})
exten => _11XX,n,GotoIf($[${ISNULL(${LOCATION})}]?voicemail,1)
exten => _11XX,n,Dial(SIP/${LOCATION},30)
exten => _11XX,n,Goto(voicemail,1)

exten => voicemail,1,NoOp()
exten => voicemail,n,Voicemail(${E}@hotdesk,u)
exten => voicemail,n,Hangup()

Hot-Desking (extensions.conf) | 553