[441234567890]
    ; Redirect incoming calls from trunk with context +441234567890 to internal extension 0.
    exten => _+X.,1,Goto(internal,0,1)
    
[outgoing]
    ; Redirect all calls entering this context via SIP trunk "twilio".
    exten => _X.,1,Dial(SIP/twilio/+${EXTEN})
    same => n,Hangup


[internal]
    ; Dialplan for extension 1000.
    ; Dial SIP user 1000. Timeout after 10 seconds.
    exten => 1000,1,Dial(SIP/1000,10)
    same => n,VoiceMail(${EXTEN})
    same => n,Hangup
    
    ; Dialplan for extension 1001.
    exten => 1001,1,Dial(SIP/1001,10)
    same => n,VoiceMail(${EXTEN})
    same => n,Hangup


    ; Dialgroup "everyone" at extension 0 to ring mulitple extensions. 
    exten => 0,1,Set(DIALGROUP(everyone,add)=SIP/1000)
    same => n,Set(DIALGROUP(everyone,add)=SIP/1001)
    same => n,Dial(${DIALGROUP(everyone)},10)
    same => n,VoiceMail(${EXTEN})
    same => n,Hangup


    ; Dialplans for redirecting calls to outgoing context.
    ; Redirect international calls in format 00441234567890.
    exten => _00X.,1,Goto(outgoing,${EXTEN:2},1)
    ; Redirect international calls in format +441234567890.
    exten => _+X.,1,Goto(outgoing,${EXTEN:1},1)
    ; Redirect outgoing national calls in format 01234567890.
    exten => _0ZX.,1,Goto(outgoing,44${EXTEN:1},1)