[Freeswitch-users] Media delay when calling FS from a WebRTC client

Oleg Stolyar olegstolyar at gmail.com
Fri Mar 14 03:05:30 MSK 2014 

Thanks Anthony!!!

I am using the "sleep" command in my dialplan after "answer".  Is
"answer_delay"
preferrable?


On Thu, Mar 13, 2014 at 4:54 PM, Anthony Minessale <
anthony.minessale at gmail.com> wrote:

> Its a combo of how many nic you have that are up with IP on them and the
> dtls handshake time which is 500ms to 1500 ms depending on the speed of the
> exchange which cannot be shortened.  You cannot send media at all until you
> have dtls up, this is a known limitation of dtls and they chose to do it
> that way.
>
> WebRTC is not spending a lot of time pondering legacy telephony and
> post-dial-delay etc.   Its centric on a peer-2-peer model and not even
> giving proper attention to use cases like FS where many clients are talking
> to one meta server with many WebRTC connections.  Maybe when the
> drunken-buzz of trying to change the paradigm wears off, they will have
> some bloody marys and realize you can still change it while keeping the
> things that matter in tact that the entire human race has grown to expect
> (like communication channels establishing in a quick timeframe).
>
> Until then you can set up a catch-all extension at the top of your
> dialplan with:
> <action application="set" data="answer_delay=2500"/>
>
> or add it as a global to vars.xml
>
> This adds a 2500 ms sleep after answer to consume the time of the dtls
> negotiation.
>
>
>
>
> On Thu, Mar 13, 2014 at 6:29 PM, Oleg Stolyar <olegstolyar at gmail.com>wrote:
>
>> Thanks Markus, I might do that but first I want to get both JsSip and
>> smpl5 working in my environment and confirm that simpl5 is faster for me.
>>
>>
>> On Thu, Mar 13, 2014 at 1:17 PM, mbo <mbodbg at gmx.net> wrote:
>>
>>> I’ve posted an issue regarding that to the jsip user group some time
>>> ago, but did not follow up yet.
>>>
>>> https://groups.google.com/forum/#!topic/jssip/RSAycYMD9Q0
>>>
>>> Maybe it makes sense to continue the discussion here as this problem is
>>> not related to freeswitch, maybe some Jssip developers can help if you post
>>> also details about your issue there.
>>>
>>> Thanks
>>>
>>> Markus
>>>
>>>
>>> Am 13.03.2014 um 19:31 schrieb Oleg Stolyar <olegstolyar at gmail.com>:
>>>
>>> Thanks Michael!
>>>
>>>
>>>
>>>
>>> On Thu, Mar 13, 2014 at 11:19 AM, Michael Jerris <mike at jerris.com>wrote:
>>>
>>>> jssip didnt, at least at the time we made that site, support firefox,
>>>> not sure if that has changed.  sipml5 gets the candidates sent out much
>>>> quicker than jssip does, but jssip is much simpler and nicer to use in
>>>> other ways.
>>>>
>>>> On Mar 13, 2014, at 1:56 PM, Oleg Stolyar <olegstolyar at gmail.com>
>>>> wrote:
>>>>
>>>> https://webrtc.freeswitch.org on chrome redirects to a JsJip demo.
>>>>
>>>> Same URL on Firefox redirects to smpl5 demo,
>>>>
>>>> so I was wondering if there is a reason for that and if the comparisons
>>>> between JsSip and smpl5 were done on the same browser.
>>>>
>>>>
>>>> On Thu, Mar 13, 2014 at 10:45 AM, Michael Jerris <mike at jerris.com>wrote:
>>>>
>>>>> huh?
>>>>>
>>>>> On Mar 13, 2014, at 12:50 PM, Oleg Stolyar <olegstolyar at gmail.com>
>>>>> wrote:
>>>>>
>>>>> On the same browser?
>>>>>
>>>>>
>>>>> On Thu, Mar 13, 2014 at 9:43 AM, Michael Jerris <mike at jerris.com>wrote:
>>>>>
>>>>>> sipml5 seems to handle this part much much better than jssip.
>>>>>>
>>>>>> On Mar 13, 2014, at 12:34 PM, Oleg Stolyar <olegstolyar at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>> So, this is WebRTC browser behavior, right?  Not something specific
>>>>>> to JsSip?
>>>>>>
>>>>>>
>>>>>> On Thu, Mar 13, 2014 at 9:20 AM, mbo <mbodbg at gmx.net> wrote:
>>>>>>
>>>>>>> I also have seen that it sometimes takes up to 10 seconds before the
>>>>>>> websocket message is sent, depending on the router I’m behind, but I’ve no
>>>>>>> solution for it yet.
>>>>>>>
>>>>>>>
>>>>>>> Am 13.03.2014 um 16:58 schrieb Oleg Stolyar <olegstolyar at gmail.com>:
>>>>>>>
>>>>>>> Thanks guys!  Another related question.  It's not FreeSWITCH but
>>>>>>> perhaps someone here knows.
>>>>>>>
>>>>>>> There is a delay in JsSip demo when gathering candidates.  The delay
>>>>>>> occurs after the last candidate is received and before sending the
>>>>>>> websocket message.  From looking around the web I found that it may be due
>>>>>>> to the WebRTC trying to get more candidates and only sending the message
>>>>>>> when that effort times out.
>>>>>>>
>>>>>>> Does anyone know if there is a way around it?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Thu, Mar 13, 2014 at 6:27 AM, Brian West <brian at freeswitch.org>wrote:
>>>>>>>
>>>>>>>> I don’t think you can speed this up, if you try DTLS from FS to FS
>>>>>>>> its instant, no delays but no matter what browser you selected there is
>>>>>>>> some delay.
>>>>>>>> --
>>>>>>>> Brian West
>>>>>>>> brian at freeswitch.org
>>>>>>>> FreeSWITCH Solutions, LLC
>>>>>>>> PO BOX 2531
>>>>>>>> Brookfield, WI 53008-2531
>>>>>>>> Twitter: @FreeSWITCH , @briankwest
>>>>>>>> http://www.freeswitchbook.com
>>>>>>>> http://www.freeswitchcookbook.com
>>>>>>>>
>>>>>>>> T: +1.918.420.9001  |  F: +1.918.420.9002  |  M: +1.918.424.WEST
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>>>>>>>>
>>>>>>>> On Mar 13, 2014, at 4:29 AM, mbo <mbodbg at gmx.net> wrote:
>>>>>>>>
>>>>>>>> > we also face that problem. Is there any solution to speed up DTLS
>>>>>>>> handshake so far?
>>>>>>>> >
>>>>>>>> > Thanks
>>>>>>>> >
>>>>>>>> > Markus
>>>>>>>> >
>>>>>>>>
>>>>>>>>
>>>>>>>>
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>>>>>>
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>>>>>
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>>>>
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>>
>> _________________________________________________________________________
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>>
>> 
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>>
>
>
> --
> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>
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