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

Fri Mar 14 22:49:18 MSK 2014

Follow-up in case someone else runs into this problem.

I tried my test on another machine and there was no delay before
establishing the connection with JsSip (this is the first delay I reported
that had to do with gathering ICE candidates).  It turns out that I had
VMWare Network adapters on my computer.  Once I disabled them, the delay
disappeared.

Of course the second (post-dial) delay that Anthony explained is still
there but it's short enough to not be a show-stopper for me.

On Thu, Mar 13, 2014 at 9:29 PM, Anthony Minessale <
anthony.minessale at gmail.com> wrote:

> It just sleeps whenever the channel answers so not much different.
> On Mar 13, 2014 7:07 PM, "Oleg Stolyar" <olegstolyar at gmail.com> wrote:
>
>> 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
>>>>>>>>>> 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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>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _________________________________________________________________________
>>>>>>>>> Professional FreeSWITCH Consulting Services:
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>>>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>>>
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>>
>>>>>>>>> Official FreeSWITCH Sites
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>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _________________________________________________________________________
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>>>>>>>>>
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>>
>>>>>>>>> Official FreeSWITCH Sites
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>>>>>>>>>
>>>>>>>>
>>>>>>>> _________________________________________________________________________
>>>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>>>> consulting at freeswitch.org
>>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>>
>>>>>>>> 
>>>>>>>> 
>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>> _________________________________________________________________________
>>>>>>>> Professional FreeSWITCH Consulting Services:
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>>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>>
>>>>>>>> 
>>>>>>>> 
>>>>>>>>
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>>>>>>>>
>>>>>>>
>>>>>>> _________________________________________________________________________
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>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>
>>>>>>> 
>>>>>>> 
>>>>>>>
>>>>>>> Official FreeSWITCH Sites
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>>>>>>>
>>>>>>>
>>>>>>> _________________________________________________________________________
>>>>>>> Professional FreeSWITCH Consulting Services:
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>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>
>>>>>>> 
>>>>>>> 
>>>>>>>
>>>>>>> Official FreeSWITCH Sites
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>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> consulting at freeswitch.org
>>>>>> http://www.freeswitchsolutions.com
>>>>>>
>>>>>> 
>>>>>> 
>>>>>>
>>>>>> Official FreeSWITCH Sites
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>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> consulting at freeswitch.org
>>>>>> http://www.freeswitchsolutions.com
>>>>>>
>>>>>> 
>>>>>> 
>>>>>>
>>>>>> Official FreeSWITCH Sites
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>>>>>>
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>>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> 
>>>>> 
>>>>>
>>>>> Official FreeSWITCH Sites
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>>>>>
>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> 
>>>>> 
>>>>>
>>>>> Official FreeSWITCH Sites
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>>>>>
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>>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
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>>>> http://www.freeswitchsolutions.com
>>>>
>>>> 
>>>> 
>>>>
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>>>>
>>>
>>>
>>> --
>>> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>>>
>>> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
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>>
>> _________________________________________________________________________
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>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
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>>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
> 
> 
>
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