[Freeswitch-users] Delay Round Two...FIGHT!

Tue Jan 15 01:33:40 MSK 2013

Words like delay can lead to a lot of confusion because there are so many
ways the word is used.

The delay problem William is talking about is a permanent delay that was a
brief bug we had where the audio streams were always out of sync.

The problem described sounds more like "setup delay" which is: The audio is
in sync but its not bi-directional for a long period of time.  This sounds
to me like one of the many Sonus bugs we have fought where passing rtp
streams to a Sonus would cause it to restart its jitter buffer and eat up
audio.

What you should do follow these steps:

1) Install GIT HEAD (not stable branch) because the stable branch cannot be
modified and the code is too old to diagnose problems on.

2) Reproduce the problem and get traces / log caps.  (if you cannot
reproduce it on demand its likely an environmental issue since most delay
bugs that are our fault are consistent)

3) Report them to JIRA not to this mailing list.  Problems are impossible
to track over email... That's why we have an issue tracker.

Re-reading this :  I see you mentioned ATT so its almost for sure the Sonus
bug.

Try this:

edit your sofia profile and set the param rtp-rewrite-timestamps to true

My suspicion: The ATT calls you, then it bridges over to FS that maybe
sends some data like playing a "please hold" sound or enters a queue
something.  Then bridges to a phone.  By default we preserve timestamps on
RTP so when we send the stamps from the phone it confuses it and makes it
go insane.   This param will rewrite all timestamps so it always sees them
coming from a generated base rather than passing them.

BTW: "thousands of calls per second" ... no ... That's why we don't touch
the subject of load testing....

On Mon, Jan 14, 2013 at 4:02 PM, Brent Paddon <brent.paddon at gmail.com>wrote:

> Figure out how to use Wireshark and a SPAN (mirror) port on your
> switch(es) and things will become a lot clearer for you.  You'll be able to
> see what is actually happening on the network instead of guessing.
>
> Brent
>
>
> On Tue, Jan 15, 2013 at 2:32 AM, Blake Priddy <bpriddy at bryantschools.org>wrote:
>
>> Well our server has 6 cores. William, we are running stable on debian.
>> Any other brain busters? I need as many possibilites of issues as possible.
>> Roger, we have gig across the network. But I will give it a shot just to
>> eliminate that possibility.
>>
>>
>> On Mon, Jan 14, 2013 at 10:10 AM, Roger Castaldo <
>> roger.castaldo at gmail.com> wrote:
>>
>>> Another option, to at least eliminate issues, assuming it happens on all
>>> calls is to connect a phone either directly to the server, ie spare nic
>>> port or as close as possible, ie same switch and perform an external call
>>> to that phone to see if the delay occurs.  This would at least allow you to
>>> eliminate a network latency between the server and the secretaries phone
>>> which would cause delays in audio as well since freeswitch cannot send
>>> audio if the audio hasn't arrived to it yet.  Just a thought on trying to
>>> eliminate the possible.
>>>
>>>
>>> On Mon, Jan 14, 2013 at 10:47 AM, William King <
>>> william.king at quentustech.com> wrote:
>>>
>>>> Do you happen to be running the stable branch? If so then I believe the
>>>> issue you are hitting was already fixed in master. If you have a chance
>>>> to test, see if the length of the audio delay is about the same amount
>>>> of time as the secretaries phone was ringing. If that is the case, then
>>>> it should already be fixed in master.
>>>>
>>>> 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 01/14/2013 06:45 AM, Blake Priddy wrote:
>>>> > Ok everyone, hope your new years went wonderful! So here is the
>>>> > situation again. THE DELAY IS BACK! I have wiped FS and installed the
>>>> > latest git head and the delay is still present. I want to eliminate
>>>> all
>>>> > FS options that could fix it before I call AT&T. Any help is
>>>> > appreciated! Person from outside the school calls, secretary answers,
>>>> > secretary hears they person saying hello, secretary says hello over
>>>> and
>>>> > over again for 10 seconds. Then the B-Leg audio finally is heard by
>>>> the
>>>> > A-LEG. Note* The B-Leg (secretary) can hear the A-leg talking the
>>>> whole
>>>> > time. Just the A-Leg cannot hear the (secretary) B-Leg until about
>>>> 7-13
>>>> > seconds has passed. I see nothing in the FS log after the audio from
>>>> the
>>>> > B-Leg finally traverses to the A-Leg. Please help our school fellow FS
>>>> > users!
>>>> >
>>>> > LONG LIVE FS!!! :)
>>>> >
>>>> > --
>>>> >
>>>> > *Blakelund Priddy*
>>>> > Network Systems Engineer
>>>> > Bryant Public School District
>>>> > Bryant, Arkansas 72022
>>>> > http://www.bryantschools.org <http://www.bryantschools.org/>
>>>> > p 501-653-5038
>>>> > f 501-847-5656
>>>> >
>>>> >
>>>> >
>>>> _________________________________________________________________________
>>>> > Professional FreeSWITCH Consulting Services:
>>>> > consulting at freeswitch.org
>>>> > http://www.freeswitchsolutions.com
>>>> >
>>>> > 
>>>> > 
>>>> >
>>>> > Official FreeSWITCH Sites
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>>>> > http://www.cluecon.com
>>>> >
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>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
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>>>> http://www.freeswitchsolutions.com
>>>>
>>>> 
>>>> 
>>>>
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>>>>
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>>>
>>>
>>> _________________________________________________________________________
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>>> http://www.freeswitchsolutions.com
>>>
>>> 
>>> 
>>>
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>>>
>>
>>
>> --
>>
>> *Blakelund Priddy*
>>
>>  Network Systems Engineer
>> Bryant Public School District
>> Bryant, Arkansas 72022
>> http://www.bryantschools.org
>> p 501-653-5038
>> f 501-847-5656
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://wiki.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>>
>>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
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>

-- 
Anthony Minessale II

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