[Asterisk-Users] Asterisk 1.2.4 IAX2 New Jitterbuffer Tuning

Tue Feb 21 06:18:37 MST 2006

Thank you for validating that I am not going mad!

I made some additional tweaks for today.  We'll see how it goes.  If not
well, then I'll try SIP for tomorrow.

Thanks,
Adam

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Peter Fern
Sent: Tuesday, February 21, 2006 7:59 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Asterisk 1.2.4 IAX2 New Jitterbuffer
Tuning

I had exactly the same experience running IAX2, but also experienced
half-duplex calls on top of that (though I think that's a different but
with IAX handoff), and in the end dropped it completely for SIP.

We run g729 over dedicated fibre, and the resyncs were occurring all
over the place with quite ludicrous values logged for delay.  I tried
tweaking the jitterbuf, turning it off completely, and reverting to the
old jitterbuffer implementation. none of which made any difference.  I
also tried with and without trunking enabled.

SIP is running much more acceptably now.

Adam Robins wrote:

> 
>After many days of playing with the new jitterbuffer and trunking
options for IAX2, I have finally received almost acceptable quality.  I
am receiving 5-8 complaints a day of calls "breaking up" from both the
customer and agent sides.  What I have discovered is that in most of
these cases, the new jitterbuffer performed a resync during the call.
Currently, I have the resyncthreshold, and all other jb parameters at
their default levels  The traffic is running over a fairly high latency
WAN connection between Canada and Atlanta (IAX2, ILBC).  Idle ping times
run about 85ms.
> 
>Below are the resync messages for this past Friday.  Knowing that I
have a slow connection, should I set the resync at a much higher level?
I appreciate any assistance you may provide.
> 
>Thanks,
>Adam
> 
>Feb 17 09:07:41 WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay

>-34, this delay 1651, threshold 1488, new offset -1651 Feb 17 09:07:42 
>WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay -120, this 
>delay -1684, threshold 1000, new offset 33 Feb 17 10:21:04 
>WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay 176, this delay

>1835, threshold 1126, new offset -1835 Feb 17 10:21:04 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay 32, this delay 1673, 
>threshold 1062, new offset -1673 Feb 17 10:21:04 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -150, this delay -1663, 
>threshold 1300, new offset -172 Feb 17 10:21:04 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -150, this delay -1635, 
>threshold 1300, new offset -38 Feb 17 10:21:48 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -22, this delay 2335, 
>threshold 1054, new offset -2373 Feb 17 10:21:48 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay 11, this delay 2363, 
>threshold 1082, new offset -2535 Feb 17 10:21:48 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -71, this delay 2249, 
>threshold 1054, new offset -2249 Feb 17 10:21:48 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -180, this delay -2359, 
>threshold 1360, new offset -14 Feb 17 10:21:48 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -150, this delay -2354, 
>threshold 1300, new offset -181 Feb 17 10:21:48 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -120, this delay -2297, 
>threshold 1240, new offset 48 Feb 17 10:34:28 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay 109, this delay 1556, 
>threshold 1136, new offset -1556 Feb 17 10:34:28 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -30, this delay -1439, 
>threshold 1000, new offset -117 Feb 17 10:34:32 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -7, this delay 1608, 
>threshold 1048, new offset -1725 Feb 17 10:34:32 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -29, this delay -1616, 
>threshold 1058, new offset -109 Feb 17 10:45:08 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay 21, this delay 1751, 
>threshold 1620, new offset -1751 Feb 17 10:45:08 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -7, this delay 1724, 
>threshold 1686, new offset -1724 Feb 17 10:45:08 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -60, this delay -1716, 
>threshold 1000, new offset -8 Feb 17 10:45:08 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -119, this delay -1757, 
>threshold 1000, new offset 6 Feb 17 11:28:45 WARNING[1078] chan_iax2.c:

>Resyncing the jb. last_delay 75, this delay 1421, threshold 1326, new 
>offset -1421 Feb 17 11:28:45 WARNING[1078] chan_iax2.c: Resyncing the 
>jb. last_delay 274, this delay 1595, threshold 1282, new offset -1595 
>Feb 17 11:29:03 WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay

>-1311, this delay 820, threshold 1824, new offset -2415 Feb 17 11:29:03

>WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay -1349, this 
>delay 761, threshold 1752, new offset -2182 Feb 17 11:29:03 
>WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay -299, this 
>delay -2127, threshold 1598, new offset -288 Feb 17 11:29:03 
>WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay -270, this 
>delay -2106, threshold 1540, new offset -76 Feb 17 11:46:15 
>WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay 98, this delay 
>1878, threshold 1206, new offset -1878 Feb 17 11:46:15 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay 44, this delay 1799, 
>threshold 1150, new offset -1799 Feb 17 11:46:15 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay 28, this delay 1781, 
>threshold 1146, new offset -1781 Feb 17 11:46:15 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -150, this delay -1753, 
>threshold 1000, new offset -46 Feb 17 11:46:15 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -150, this delay -1765, 
>threshold 1000, new offset -16 Feb 17 11:46:15 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -149, this delay -1747, 
>threshold 1298, new offset -131 Feb 17 11:54:36 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay -44, this delay 1136, 
>threshold 1064, new offset -1152 Feb 17 11:54:36 WARNING[1078] 
>chan_iax2.c: Resyncing the jb. last_delay 1, this delay 1155, threshold

>1080, new offset -1155 Feb 17 11:54:36 WARNING[1078] chan_iax2.c: 
>Resyncing the jb. last_delay 405, this delay 1547, threshold 1080, new 
>offset -1547 Feb 17 11:54:36 WARNING[1078] chan_iax2.c: Resyncing the 
>jb. last_delay -26, this delay 1115, threshold 1054, new offset -1115 
>Feb 17 11:54:36 WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay

>-60, this delay -1133, threshold 1000, new offset -414 Feb 17 11:54:48 
>WARNING[1078] chan_iax2.c: Resyncing the jb. last_delay 3, this delay 
>1144, threshold 1048, new offset -1558
>
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