[Freeswitch-users] Need info on pre_answer app

[Michael Collins]

Duly noted, and will hopefully put this into the fs book and/or wiki as
appropriate...

-MC

> -----Original Message-----
> From: freeswitch-users-bounces at lists.freeswitch.org
[mailto:freeswitch-
> users-bounces at lists.freeswitch.org] On Behalf Of Michael Jerris
> Sent: Wednesday, March 05, 2008 12:01 PM
> To: freeswitch-users at lists.freeswitch.org
> Subject: Re: [Freeswitch-users] Need info on pre_answer app
> 
> 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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