[Freeswitch-users] Where to put Jitterbuffer?

[Anthony Minessale]

When you keep the codec the same across the whole call path then the
jitterbuffer is not as important because FS will preserve the timestamps.
If you are transcoding or recording the call, then the JB can help because
you are creating new timestamps so the far end can no longer perceive the
jitter.

Ideally you should just try it.
Also you should make sure your vpn is using udp or gprs not tcp

You should probably try it with everything PCMU or PCMA as well with and
without the JB.
Trial and error is your friend.  But without the vars I mentioned it will
never use the JB during a bridge.






On Mon, Feb 15, 2016 at 6:33 PM, Rajil Saraswat <rajil.s at gmail.com> wrote:

> Ok, what about my specific use case where both endpoints ATA (Linksys
> spa3102) do have internal jitterbuffer. Should i still set the global
> variables as you suggested to improve the call quality over vpn?
>
> On 15 February 2016 at 18:23, Anthony Minessale <
> anthony.minessale at gmail.com> wrote:
>
>> If one or the other end of the call does not have its own JB then putting
>> it on both sides can fix the stream for the other end.
>> That is why its not defaulted to being possible but you asked how to do
>> it.
>>
>>
>> On Mon, Feb 15, 2016 at 5:54 PM, Rajil Saraswat <rajil.s at gmail.com>
>> wrote:
>>
>>>
>>> The wiki page (https://wiki.freeswitch.org/wiki/Jitterbuffer) says,
>>>
>>> If both sides of a bridge are RTP and both sides have a jb, its fairly
>>> useless.  In fact if anything, it can worsen call quality.
>>>
>>> So if I set jitterbuffer on both of my FS instances as global variables, wont that be against what the wiki says?
>>>
>>>
>>> On 15 February 2016 at 17:10, Anthony Minessale <
>>> anthony.minessale at gmail.com> wrote:
>>>
>>>> The variable must be set on the leg before the channel engages media.
>>>> you can test if its on with
>>>>
>>>> uuid_jitterbuffer <uuid> debug:10
>>>>
>>>>
>>>> if you want it on both legs set the following global vars in vars.xml
>>>>
>>>> rtp_jitter_buffer_during_bridge=true
>>>>
>>>> jitterbuffer_msec=60
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Mon, Feb 15, 2016 at 4:44 PM, Rajil Saraswat <rajil.s at gmail.com>
>>>> wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I have two FS instances connected to each other over VPN. The VPN
>>>>> sometimes has poor connectivity and I was wondering whether
>>>>> jitterbuffer can help to improve the call quality. I am using the OPUS
>>>>> codec between the FS instances since it is supposed to behave better
>>>>> in lower bandwidth. The ATA on both ends are Linksys SPA3102.
>>>>>
>>>>> My connections is as follows:
>>>>>
>>>>> ATA_A---->FS_A---->vpn---->FS_B---->ATA_B
>>>>>
>>>>>
>>>>> When user A is calling to B where should i specify jitter buffer
>>>>> amongst the following:
>>>>>
>>>>> 1. The bridge between Freeswitch instance FS_A and FS_B
>>>>> <action application="bridge"
>>>>> data="{jitterbuffer_msec=60}sofia/gateway/$1 at FS_B_IP"/>
>>>>>
>>>>> 2. The bridge between Freeswitch instance FS_B and ATA_B
>>>>> <action application="bridge"
>>>>> data="{jitterbuffer_msec=60}sofia/internal/$1 at ATA_B_IP"/>
>>>>>
>>>>> Thanks,
>>>>> Rajil
>>>>>
>>>>>
>>>>> _________________________________________________________________________
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>>>>
>>>>
>>>>
>>>> --
>>>> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>>>>
>>>> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
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>>>>
>>>>
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>>>
>>>
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>>
>>
>>
>> --
>> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>>
>> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
>> http://twitter.com/FreeSWITCH
>> ☞ irc.freenode.net #freeswitch ☞ *http://freeswitch.org/g+
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>>
>> https://www.youtube.com/watch?v=9XXgW34t40s
>> https://www.youtube.com/watch?v=NLaDpGQuZDA
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
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>> http://www.cluecon.com
>>
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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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