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

[Mathieu Rene]

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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