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

Anthony Minessale anthony.minessale at gmail.com
Fri Mar 14 02:54:24 MSK 2014 

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
>>>>>>> iNUM: +883 5100 1420 9001
>>>>>>> ISN: 410*543
>>>>>>> Skype:briankwest
>>>>>>> PGP Key: http://www.bkw.org/key.txt (AB93356707C76CED)
>>>>>>>
>>>>>>> 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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>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
> 
> 
>
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>


-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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