It wasn't a problem related to drivers or other, it was sufficient modify
extensions.conf including a Wait statement:
[default]
exten => s,1,Ringing
exten => s,2,Wait,3
exten => s,3,Answer
exten => s,4,Dial(SIP/401,18)
exten => s,5,NoOp(Status ${DIALSTATUS})
exten => s,6,VoiceMail([EMAIL PROTECTED])
exten => s,7,HangupThanks, dave
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