[Freeswitch-users] Sound delays when using WebRTC

Anthony Minessale anthony.minessale at gmail.com
Thu Jan 15 23:57:41 MSK 2015

First you should try updating to latest master.
Basically if you are doing webrtc development you need to constantly update
to keep up with the moving target.

If you still notice its clipping a bit you can set the global variable
answer_delay=2500 in vars.xml to pad the beginning of the call.  There is
not hooks for dialplan to know about ice, its abstract.  however in newer
versions the act of answering the call will cause the core to read
constantly until at least the ice is negotiated.

This is more of a side-effect of not caring about normal telephony
expectations on the part of the webrtc implementors than anything else.
Its an inherent side-effect of ice and dtls to cause call setup errors.

On Thu, Jan 15, 2015 at 2:36 PM, Robert Smallwood <rdsmallwood928 at gmail.com>

> Hi All,
> I'm currently using a browser (chrome) to make calls via webrtc to
> freeswitch (1.5.15b+git~20141219T193610Z~35cb0ad286~64bit).  However, I am
> experiencing delays when hearing our initial prompting message.  I'd like
> to hook onto some event that lets me know that all of session.streamFile()
> will be heard and not cut off.
> We have a dial plan,  and in that dial plan (js file) we do this sequence
> of events... (psuedo code)
> if(session.ready())
>    session.answer()
>    ...some reading of headers...
>    session.streamFile("Our welcome prompt", func return true)
> On the client side I can watch the logs and notice that I hear media as
> soon as this log comes through:
> | jssip.rtcsession.rtcmediahandler | ICE connection state changed to
> "connected"
> However, this can be a second or two behind the streamFile call in the
> dial-plan.
> What I would like to be able to do is hook into the ICE state change in
> the dial-plan file and wait until I get it to start streaming the file.
> I have tried playing around with some of the methods found here:
> https://wiki.freeswitch.org/wiki/Session, namely session.mediaReady,
> session.waitForMedia, and checking the session.state to see if any of them
> change when I get the ice state message client side to no avail.
> Is there a way to accomplish this  (Listening for ICE state changes in a
> dial plan)?
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Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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