I forget the GR that specifies this, but unless a human answers, they don't have to actually send an ISUP ANS back..It's quite common.. The biggest one I can remember is US Airways..<br><br><div class="gmail_quote">
On Wed, Jul 27, 2011 at 3:05 PM, Jay Hennigan <span dir="ltr"><<a href="mailto:jay@west.net">jay@west.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
On 7/27/11 6:28 AM, Stephen Sprunk wrote:<br>
<br>
> I've had numerous customers ask for longer ringback timeouts on the<br>
> calling side; it turns out that the above is a /very/ common practice<br>
> for toll-free numbers. The menus and hold music are all "ringback"<br>
> messages, and the call isn't actually "answered" until a human agent<br>
> gets on the line. As many of us are unfortunately aware from our own<br>
> experience calling customer (dis)service lines, that can easily exceed<br>
> five minutes.<br>
<br>
The menus? Really?<br>
<br>
I have had issues with this and as far as I can tell, the menus should<br>
not be considered ringing.<br>
<br>
We have had reports of DTMF failures navigating the IVR of toll-free<br>
numbers from time to time. American Airlines is one specific example.<br>
<br>
What we have found is that there really isn't a DTMF issue, but that the<br>
forward audio path is being disabled until answer somewhere enroute.<br>
This is to me the correct behavior and was implemented at least a decade<br>
ago as a fraud prevention measure to prevent an endpoint from simply not<br>
providing answer supervision and conversing.<br>
<br>
>From what I recall, the forward audio path is *supposed* to be blocked<br>
until the call is answered. Reverse audio is enabled for ringback<br>
tones, intercept recordings, and the like.<br>
<br>
For a toll-free end user to deliberately not provide answer supervision<br>
(and thus start billing) and expect to process DTMF into a menu or for<br>
that matter just carry on a conversation seems fraudulent.<br>
<br>
Of course American Airlines and the like is kind of an 800-pound gorilla<br>
and trying to get them or their carrier to alter this behavior of a free<br>
ride navigating the menus would be an uphill battle.<br>
<br>
So I could theoretically have a toll-free number that would have a menu,<br>
"Press 1 to hear an audiobook recording of 'War and Peace'; press 2 to<br>
hear the 1812 overture..." and run it for free? Doesn't seem kosher.<br>
<font color="#888888"><br>
--<br>
Jay Hennigan - CCIE #7880 - Network Engineering - <a href="mailto:jay@impulse.net">jay@impulse.net</a><br>
Impulse Internet Service - <a href="http://www.impulse.net/" target="_blank">http://www.impulse.net/</a><br>
Your local telephone and internet company - <a href="tel:805%20884-6323" value="+18058846323">805 884-6323</a> - WB6RDV<br>
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