[Freeswitch-users] Need info on pre_answer app

[Jonas Gauffin]

added to wiki.

On Wed, Mar 5, 2008 at 9:11 PM, Michael Collins <mcollins at fcnetwork.com> wrote:
> 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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