[Freeswitch-users] Odp: Re: can mod_httapi decide if the call should be answerred?

[Anthony Minessale]

Those seem logical to be available without special permissions so I added
them to latest GIT.

answer preAnswer and ringReady tags.



On Thu, Jun 27, 2013 at 4:06 PM, Rafal Gwizdala <rafal.gwizdala at gmail.com>wrote:

> Thanks guys
> R
>
>
> On Thu, Jun 27, 2013 at 9:25 PM, Mariusz Czulada <manieq at wp.eu> wrote:
>
>> Rafał,
>>
>>
>>
>> Dnia Czwartek, 27 Czerwca 2013 12:52 Rafal Gwizdala <
>> rafal.gwizdala at gmail.com> napisał(a)
>>
>> On Thu, Jun 27, 2013 at 12:49 PM, Rafal Gwizdala <
>> rafal.gwizdala at gmail.com> wrote:
>>
>>>  2. You don't need to answer the call in the httapi script
>>> This one looks quite strange but I think I finally understood it - I can
>>> play back sounds or 'say' something without explicitly 'answerring' the
>>> call. But the call is 'pre-answerred' only and in this state you won't be
>>> able to collect dtmf, for example. I don't know what is the exact
>>> difference between a pre-answerred and answerred call but one nice thing is
>>> that when you <hangup /> or <break /> in this state the call will be
>>> rejected and the caller will hear a 'busy' signal.
>>>
>>>
>>
>> Session is established when you send 200/OK response (that's what
>> "answer" does). This means media will be send in both directions.
>>
>>
>>
>> What you experienced here is an early media mode. Because you did not
>> explicitly called any responding app (neiher "answer" not "pre_answer") so
>> mod_sofia did the second for you. "pre_answer" sends 183/Sesion Progress
>> response. This means that B-side (your server) is willing to send media to
>> other side. You should receive PRACK as a "response to response" if A-side
>> accepts it. From this point you can send anything, but _should_ not expect
>> any media to received. This is a situation similar to commonly used custom
>> ring tones (with music).
>>
>>
>>
>> Of course it is possible to use media in both/either side by setting
>> P-Early-Media header in 183 response. Refer to RFC5009 for details.
>>
>>
>>
>> Also keep in mind, that 183 _does_ _not_ establish a session. It means
>> that calling side may expexty this is a free time like during ringing. If
>> A-side is a UE of a local user (in terms of service, not distance/net) it
>> will be probably ok. But if you connect FSW to some class 4/5 softswitch,
>> it may be misleading, because the call can be not charged on calling side
>> (i.e. provider). Only after sending 200/OK again ("answer" later) you will
>> establish a call.
>>
>>
>>
>> For all above I suggest you to explicitly call "answer" or "pre_answer"
>> _before_ sending any media to other side. You will have 100% control of a
>> call status and also not relay on mod_sofia responses which [are fine of
>> course, but] may be different from what you intended (but now executed).
>>
>>
>>
>> Hope it is clear enough ;)
>>
>>
>>
>> Regards,
>>
>> Mariusz
>>
>>
>> _________________________________________________________________________
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>>
>> 
>> 
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>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
> 
> 
>
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-- 
Anthony Minessale II

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