[Freeswitch-users] AWS - Audio Delay - rtp timer

[Jacob Greene]

Thanks for the info. That's really interesting. I have the jitter buffer
completely disabled like this:

"<action application="set" data="jitterbuffer_msec="/>"

Disabling the jitter buffer reduced the reports from our customers of audio
delay.  It seems counter intuitive that turning on an additional buffer
would decrease delay. I wonder what is causing this? Any ideas?

I'll setup some kind of canary deployment and see if I get similar results
with the rtp-timer disabled and the jitter buffer on.

Really appreciate your input!

On Mon, Jan 18, 2021, 9:46 AM Jurijs Ivolga <jurijs.ivolga at gmail.com> wrote:

> Hi,
>
> I got similar problems. For me solution was to enable jitter buffer,
> something like this:
>
> ....
> <action application="set" data="rtp_jitter_buffer_during_bridge=true"/>
> <action application="set" data="jitterbuffer_msec=60:200:20"/>
> <action application="export" data="nolocal:jitterbuffer_msec=60:200:20"/>
> <action application="export"
> data="nolocal:rtp_jitter_buffer_during_bridge=true"/>
> <action application="bridge" data="some_bridge_data" />
> ....
>
> In this case I didn't get delay when I set "<param name="rtp-timer-name"
> value="soft"/>" in sip profile.
>
> Jurijs
>
>
> On Mon, Jan 18, 2021 at 5:10 PM Jacob Greene <jacobgreene1991 at gmail.com>
> wrote:
>
>> Hello everyone,
>>
>> Recently, I am running into an issue with some severe audio delay  with
>> some freeswitch boxes running on AWS. It gets to the point where audio is
>> delayed up to 10 seconds in both directions. The calls start off fine and
>> slowly get worse.
>>
>> The only way I've been able to fix this is by disabling the rtp timer on
>> the sofia profile(rtp-timer-name=none). Making this change immediately
>> fixes the issue.
>>
>> No obvious system bottlenecks, 1/5/15 min load averages all less 1 on
>> dual core CPUs, tons of free memory, no I/O issues on the nic, etc.
>>
>> I suspect this might have something to do with some weird CPU sharing AWS
>> is doing on their hypervisor, but I'm not sure.
>>
>> I can't find a ton of info on exactly what the rtp timer does, other than
>> disabling it "disables asynchronous rtp" and "makes freeswitch handle media
>> the same way as asterisks". I'm not really sure what this means. I've read
>> it's less effecient and come across a couple very old post on the mailing
>> list of Anthony steering people away from disabling the rtp-timer.
>>
>> Has anyone had a similar problem? Or does anyone have some more
>> information/resources regarding exactly what the function of the rtp timer
>> is? I'm trying to get in front of this. What are the drawbacks of not using
>> an rtp timer?
>>
>> Thanks for reading!
>> _________________________________________________________________________
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>
> _________________________________________________________________________
>
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> Build your next product on our scalable cloud platform.
>
> Join our online community to chat in real time
> https://signalwire.community
>
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
>
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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