[asterisk-users] Measuring audio file legth

[Stephen Bosch]

Bob Smither wrote:
> On Thu, 2007-04-12 at 13:28 +0200, Suity Zsolt wrote:
>> Hi,
>>
>> I have to set call length to 3min, but before hangup have to warn 
>> caller. There are many IVRmenu and submenu options with different 
>> warning audio.
>> I have to measure somehow the audio file length and subtract it from 3 
>> minutes.
> 
> I have not tried this, so I may be off - but do you really have to do
> this?  The documentation I have indicates that if there is an extension
> T in the context, that extension is used at the absolute timeout.  So,
> would:
> 
>   exten => T,1,<play your warning message>
>   exten => T,n,Hangup

What if he wants to warn the caller with 30 seconds remaining? Then 15?
Then 5?

-Stephen-