[asterisk-users] JITTERBUFFER function

[John Novack SCII]

Google is your friend!!!

http://searchunifiedcommunications.techtarget.com/definition/jitter-buffer
http://www.voiptroubleshooter.com/problems/jitterbuffer.html
http://www.voip-info.org/wiki/view/Asterisk+new+jitterbuffer
http://www.webopedia.com/TERM/J/jitter_buffer.html


Peg Leg O'Brien

amertel wrote:
> WTF is a jitterbuffer?
>
>
> Sent from my Verizon Wireless 4G LTE smartphone
>
>
> -------- Original message --------
> From: Matthew Jordan <mjordan at digium.com>
> Date: 01/29/2015 10:41 AM (GMT-05:00)
> To: Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users at lists.digium.com>
> Subject: Re: [asterisk-users] JITTERBUFFER function
>
> On Thu, Jan 29, 2015 at 4:56 AM, Torbjorn Abrahamsson
> <torbjorn.abrahamsson at gmail.com> wrote:
> > Hello!
> >
> >
> >
> > I am going to use the JITTERBUFFER function in a SIP (and local channels)
> > only setup, but have some questions of how to use it:
> >
> >
> >
> > 1.       Do I need to activate jbenable in sip.conf? Or is it enough to call
> > the JITTERBUFFER function?
>
> You only need to use the JITTERBUFFER function.
>
> The jbenable option will enable a jitter buffer on every channel
> created for that peer (or, if global, for every peer in the system).
> Depending on the version of Asterisk, it will also place the jitter
> buffer on the write side of the channel, which is often not what you
> want.
>
> > 2.       What is the preferred way to invoke this function? Say I have
> > channel A which is not in need of buffering, while channel B do need it. If
> > A calls B and I do Set(JITTERBUFFER(fixed)=default), my guess is that it
> > will be attached to channel A:s read side. This is not the desired outcome,
> > as I would like to have it on B:s read side. How should I invoke this to
> > make the buffer belong to channel B? Maybe using b option to Dial? So that
> > when a JB-enabled device (B) calls out one just calls JITTERBUFFER from the
> > normal dialplan flow, and if there is a call to the device (B) one need to
> > use b option? Sound correct?
> >
>
> Invocation examples are on the wiki:
>
> https://wiki.asterisk.org/wiki/display/AST/Asterisk+13+Function_JITTERBUFFER
>
> The JITTERBUFFER function only affects the channel it is placed on,
> and not any channel it may be bridged with. That means you have to
> place it on the correct channel and not expect some magicry inside
> Asterisk to try and manipulate things for you (which is almost always
> a bad implementation decision). If you need it on an outbound channel,
> that means using one of the pre-dial handlers
> (https://wiki.asterisk.org/wiki/display/AST/Pre-Dial+Handlers) to
> place the jitter buffer on the outbound channel after its creation.
>
> Example:
>
> [default]
>
> exten => set_up_outbound,1,NoOp()
> same => n,Set(JITTERBUFFER(adaptive)=default)
> same => n,Return()
>
> exten => outbound_dial,1,NoOp()
> same => n,Dial(PJSIP/Alice,,b(default^set_up_outbound^1))
> ...
>
> -- 
> Matthew Jordan
> Digium, Inc. | Engineering Manager
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: http://digium.com & http://asterisk.org
>
> -- 
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-- 
Dog is my Co-Pilot

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