[Freeswitch-users] What is the difference between preAnswer and ring_ready?

[Michael Collins]

Well said, Math. BTW, this info is available on the wiki:
http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_ring_ready
http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_pre_answer

-MC

On Sat, Aug 29, 2009 at 8:54 PM, Mathieu Rene <mrene_lists at avgs.ca> wrote:

> Hi,
>
> In SIP, ring_ready will send a 180 ringing, pre answer will send a 183
> with a session description, so that some audio can be exchanged while
> the call isnt answered yet (used a lot for inband error messages etc).
>
> Regards,
>
> Mathieu Rene
> Avant-Garde Solutions Inc
> Office: + 1 (514) 664-1044 x100
> Cell: +1 (514) 664-1044 x200
> mrene at avgs.ca
>
>
>
>
> On 29-Aug-09, at 9:50 PM, Jason White wrote:
>
> > Max Bridgewater <max.bridgewater at gmail.com> wrote:
> >> Hi,
> >> Assuming an inbound call, I have trouble understanding what the
> >> supposed
> >> difference between the following two set of instructions is:
> >>
> >> session.execute("ring_ready");
> >> session.set("set", "ringback=/home/ring.wav");
> >
> > Ring_ready sends a SIP "ringing" message and will use your device's
> > default
> > ringback sound - at least, that has been my experience. I should
> > remember the
> > message number in the SIP protocol, but I don't (the SIP experts
> > here will
> > undoubtedly have the details at the ready).
> >>
> >> and
> >>
> >> session.preAnswer();
> >> session.streamFile("/home/ring.wav")
> >
> > I think that will play the file as early media.
> >
> >
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