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rajil.s at gmail.com Guest
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Posted: Mon Feb 15, 2016 5:46 pm Post subject: [Freeswitch-users] Where to put Jitterbuffer? |
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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@FS_B_IP"/>
2. The bridge between Freeswitch instance FS_B and ATA_B
<action application="bridge"
data="{jitterbuffer_msec=60}sofia/internal/$1@ATA_B_IP"/>
Thanks,
Rajil
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anthony.minessale at g... Guest
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rajil.s at gmail.com Guest
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Posted: Mon Feb 15, 2016 6:56 pm Post subject: [Freeswitch-users] Where to put Jitterbuffer? |
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The wiki page (https://wiki.freeswitch.org/wiki/Jitterbuffer) says,
Quote: | 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@gmail.com (anthony.minessale@gmail.com)> wrote:
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anthony.minessale at g... Guest
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rajil.s at gmail.com Guest
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Posted: Mon Feb 15, 2016 7:35 pm Post subject: [Freeswitch-users] Where to put Jitterbuffer? |
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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@gmail.com (anthony.minessale@gmail.com)> wrote:
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anthony.minessale at g... Guest
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Posted: Mon Feb 15, 2016 7:47 pm Post subject: [Freeswitch-users] Where to put Jitterbuffer? |
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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@gmail.com (rajil.s@gmail.com)> wrote:
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