asterisk users - Jan 2009 - How to use AMD "Answering Machine Detect" ?

Hi everybody,

   Happy New Year !

   I'm trying to detect if a call was answered by a machine (linke
voicemail systems) or a human.
   I would like to use AMD (Answering Machine Detect) command, but
with my configuration it was not possible get there.

   Follow my dialplan:

     exten => _[789].,1,NoCDR
     exten => _[789].,n,Dial(SIP/${EXTEN}@111,60)
     exten => _[789].,n,AMD
     exten => _[789].,n,NoOp(AMD Status is: ${AMDSTATUS})
     exten => _[789].,n,Hangup

   What is happening is when the call is answered by the other part,
Asterisk doesn't go to the next level (exten => _[789].,n,AMD). So AMD
can't verify the call.

How can I do this ? Any idea ?

Thanks in advance.

--

Daniel Varella de Oliveira
Consultor de T.I.
Cel.: +55(21)8615-6050

Linux Professional Certified
LPI000143643

Information Technology Infrastructure Library - ITIL Certified
EXIN - 944759

Daniel Varella wrote:
> Hi everybody,
> 
>    Happy New Year !
> 
>    I'm trying to detect if a call was answered by a machine (linke
> voicemail systems) or a human.
>    I would like to use AMD (Answering Machine Detect) command, but
> with my configuration it was not possible get there.
> 
>    Follow my dialplan:
> 
>      exten => _[789].,1,NoCDR
>      exten => _[789].,n,Dial(SIP/${EXTEN}@111,60)
>      exten => _[789].,n,AMD
>      exten => _[789].,n,NoOp(AMD Status is: ${AMDSTATUS})
>      exten => _[789].,n,Hangup
> 
>    What is happening is when the call is answered by the other part,
> Asterisk doesn't go to the next level (exten => _[789].,n,AMD). So
AMD
> can't verify the call.
> 
> How can I do this ? Any idea ?
> 
> Thanks in advance.
> 
The Dial app will not exit until the call is completed (one or both 
parties hang up). You need to put what you want to happen during the 
call in a macro and then call the macro with the M() option to Dial (see 
the Dial app help text).

-Dave

Daniel Varella a ?crit :
> Hi everybody,
>
>    Happy New Year !
>
>    I'm trying to detect if a call was answered by a machine (linke
> voicemail systems) or a human.
>    I would like to use AMD (Answering Machine Detect) command, but
> with my configuration it was not possible get there.
>
>    Follow my dialplan:
>
>      exten => _[789].,1,NoCDR
>      exten => _[789].,n,Dial(SIP/${EXTEN}@111,60)
>      exten => _[789].,n,AMD
>      exten => _[789].,n,NoOp(AMD Status is: ${AMDSTATUS})
>      exten => _[789].,n,Hangup
>
>    What is happening is when the call is answered by the other part,
> Asterisk doesn't go to the next level (exten => _[789].,n,AMD). So
AMD
> can't verify the call.
>
> How can I do this ? Any idea ?
>   
iirc AMD is for the other way around, ie detect when a call receive on
your box was made
by an automated machine.

In your case, the extension stop at the Dial() command, except if nobody
answer your call.

However, maybe you can try it with the M(x) argument of Dial():

     *M(*/x/*)*: Executes the macro (x) upon connect of the call (i.e.
when the called party answers). IMPORTANT - The CDR 'billsecs' field is
set to zero if the callee answers the call, but hangs up whilst the
macro is still running (if the callee answers and the macro finishes,
'billsecs' contains the correct value).