exten => 4364,1,Dial(SIP/${EXTEN},25,twW)
exten => 4364,2,Voicemail(u${EXTEN})
exten => 4364/_4XXX,102,Goto(from-sip,4364-${DIALSTATUS},1)
exten => 4364,103,Hangup
exten => 4364-BUSY,1,Playback(beep)
exten => 4364-BUSY,2,Playback(beep)
;exten => 4364-BUSY,3,Wait(4)
exten => 4364-BUSY,3,Goto(from-sip,4364,1)

exten => 4364-ANSWER,1,Playback(beep)
exten => 4364-ANSWER,2,Playback(beep)
exten => 4364-ANSWER,3,Wait(4)
exten => 4364-ANSWER,4,Goto(from-sip,4364,1)