[inbound] ; here falls all incoming calls
exten => s,1,Answer
exten => s,2,Dial(local/200@internal,30,r)
exten => s,3,Playback(sorrynoanswer)
exten => s,4,Hangup
[internal] ; here where our phones falls for default
exten => 200,1,Dial(sip/blah)
exten => 200,102,VoiceMail(${EXTEN}@default)
exten => 201,1,Dial(DAHDI/1)
exten => 201,102,VoiceMail(${EXTEN}@default)
exten => _0.,1,Dial(DAHDI/g1/${EXTEN:1}) ; outgoing calls with 0+number