[Freeswitch-users] Need info on pre_answer app

[Michael Jerris]

pre_answer is equivalent to a sip 183 with sdp.  It establishes media  
(early media) but does not answer.  You can use this for example to  
send an in-band error message to the caller before disconnecting them  
(pre_answer, playback, reject with a cause code of xxxx).  That being  
said, most apps that require media (like playback) should do a  
pre_answer for you.  If you are having an issue with a piece of  
equipment taking a long time to setup a media path, you could do  
pre_answer, then sleep in the dial plan.

Mike

On Mar 5, 2008, at 2:45 PM, Jonas Gauffin wrote:

> I think that's the same as sending a provisional sip response. It
> means that FS have received the call request, but it havent reached
> the destination just yet.
>
> One provisional response is 180 which means Ringing.
> A final response (200) is sent when the destination user picks up  
> the phone.
>
> guess pre answer can be used if a lenghty process will be used before
> the destination picks up, to inform the caller to hang on.
>
> But hey, that's just my guess, i havent really been looking in the FS
> sourcecode about it.
>
> On Wed, Mar 5, 2008 at 8:05 PM, Michael Collins <mcollins at fcnetwork.com 
> > wrote:
>>
>>
>>
>>
>> Is anybody in a position to update the wiki, or at least shed a bit  
>> of light
>> on this subject?
>>
>> http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_pre_answer
>>
>>
>>
>> Thanks!
>>
>> -MC
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