It wasn't a problem related to drivers or other, it was sufficient modify extensions.conf including a Wait statement:<br>[default]<br>exten => s,1,Ringing<br>exten => s,2,Wait,3<br>exten => s,3,Answer<br>exten => s,4,Dial(SIP/401,18)
<br>exten => s,5,NoOp(Status ${DIALSTATUS})<br>exten => s,6,VoiceMail(402@internal)<br>exten => s,7,Hangup<br><br>Thanks,<br>dave<br><br>