[asterisk-users] False answer() being sent by cellphone providers

[Faisal Hanif]

  Do some R & D with asterisk function AMD (Answering Machine Detection) 
if that can help you.

Regards,

Faisal Hanif

On 7/9/2010 11:24 PM, Danny Nicholas wrote:
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve Edwards
> Sent: Friday, July 09, 2010 12:10 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] False answer() being sent by cellphone
> providers
>
> On Fri, 9 Jul 2010, Mike Ely wrote:
>
>>> I've set up an outbound alerting system to play a recording when systems
> go
>>> down, etc. and I'm noticing that cellphones tend to answer() and then
> start
>>> ringing the actual handset.  So far, I've verified this behavior with
>>> Verizon, T-Mobile, and Google Voice (the last produces a SERIOUS delta
>>> between bogus answer and actual answer).
>>>
>>> Has anyone figured out how to detect the actual cellphone answer rather
> than
>>> the bogus one sent by the cell carrier?  In the short term, I just have
> the
>>> call play MOH for ten seconds before announcing that all hell has broken
>>> loose in the server room, but it¹d be nice to have something a bit more
>>> accurate and reliable.
> How about a loop with "Please press pound to continue?"
> --
> It is a DAHDI "function" that you may or may not get a reliable
> "notification" of answer.  The best thing to do is to MOH for 7 seconds,
> then play a message "this is a message from the computer room; press 1 to
> accept".  This lets you not waste time on a "not real" answer.  Here is a
> "cliff-note" context:
> [accept]
> exten =>  s,1,Answer
> exten =>  s,n,WaitExten(7)
> exten =>  s,n,Background(important)
> exten =>  s,n,WaitExten(5,m)
> exten =>  1,1,backgrounf(message)
> exten =>  1,n,hangup
> exten =>  t,1,hangup
> exten =>  i,1,hangup
> exten =>  *,1,hangup
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