exten => 901,1,Answer
exten => 901,2,Wait(3)
exten => 901,3,Meetme(1234|M)
exten => 901,4,Hangup

exten => 350,1,Answer
exten => 350,2,Playtones,ring
exten => 350,3,Wait,3
exten => 350,4,Meetme(1234|M)
exten => 350,5,Hangup

exten => 100,1,VoicemailMain(${CALLERIDNUM})

IR AL IVR
exten => 200,1,Goto(mainmenu,s,1)