[Freeswitch-users] Problem with rtp streams and stair-stepped (or ramped) increased lag

[William King]

Also of note, I'm able to reproduce this only because the ISP the calls
are behind is having random(but multiple times a day) latency spikes
from ~15ms normally up to ~300ms to the first gateway past the modem.

William King
Senior Engineer
Quentus Technologies, INC
1037 NE 65th St Suite 273
Seattle, WA 98115
Main:   (877) 211-9337
Office: (206) 388-4772
Cell:   (253) 686-5518
william.king at quentustech.com

On 06/25/2013 05:13 AM, Nathan Neulinger wrote:
> I guess the big question is this:
> 
> 	Is it _supposed_ to recover?
> 
>  From Tony's notes, it's sounding like it's very critically dependent on the timer in the switch, which very well be the 
> current cause of my issues.
> 
> What I probably need to do is have a pair of phones automatically calling each other, and just leaving them up - just to 
> generate a continuous independent background stream. That'll tell me if any glitches are specific to a particular 
> channel, or if they are common across multiple calls - which I'd expect if the timer was swinging.
> 
> I don't know where my latency is being introduced unfortunately...
> 
> -- Nathan
> 
> On 06/25/2013 01:59 AM, Avi Marcus wrote:
>> It sounds like I saw  this on a home internet connection to a public server when the connection had varying latency.
>> Once the call jittered, it never recovered.
>> My stop-gap was to add a small jitter buffer <http://wiki.freeswitch.org/wiki/Jitterbuffer>, e.g. <action
>> application="jitterbuffer" data="100:200:20"/> to the user dialplan.
>> This /seemed /to make FS handle rewriting the timestamps for drift rather than relying on the Linksys ATA to do that.
>>
>> Probably the wrong solution, but all I had time/understanding for.
>> -Avi
>>
>>
>> On Tue, Jun 25, 2013 at 4:42 AM, Nathan Neulinger <nneul at mst.edu <mailto:nneul at mst.edu>> wrote:
>>
>>
>>
>>     On 06/24/2013 08:24 PM, Anthony Minessale wrote:
>>      > fsctl debug_level 10
>>      > Also make sure ve host has high res timing.
>>
>>     Turned up logging, will wait for next occurrence.
>>
>>     Not sure on the latter - it's a vmware ESXi 5.1 box running FC 17 x86_64 as the guest.
>>
>>     /dev/rtc /dev/rtc0 exist
>>     posix and soft timers are loaded in fs
>>
>>     I've got a bunch of unused Dell 1950's on hand, so could use a few of those machines if needed to get vmware out of the
>>     picture.
>>
>>     -- Nathan
>>
>>     ------------------------------------------------------------
>>     Nathan Neulinger nneul at mst.edu <mailto:nneul at mst.edu>
>>     Missouri S&T Information Technology (573) 612-1412 <tel:%28573%29%20612-1412>
>>     System Administrator - Architect
>>
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>