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[Callweaver-users] Jitter only on Cisco 7905G


 
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vegard at svanberg.no
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PostPosted: Mon Nov 17, 2008 8:32 am    Post subject: [Callweaver-users] Jitter only on Cisco 7905G Reply with quote

Hello,

I'm struggling with intermittent jitter. The weird thing is that it only
seems to affect Cisco 7905G. As far as I can see, it started after
updating CW to the 20080828 snapshot, and is still going on (although it
seems to be better now) in the 20081115 snapshot.

I have two 7905Gs, and it happens on both of them. It does not happen on
other brands. They are now upgraded to the latest SIP software (8.0.1).
Network latency isn't an issue here (LAN). (BTW, I've also had some
complaints about jitter from users with 794x phones, but I've not been
able to figure out if it's the same issue yet (probably not)).

When debugging RTP, usually the RTP debug is like this:

Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15831, ts 2534560, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29411, ts 474015944, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15832, ts 2534720, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29412, ts 474016104, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15833, ts 2534880, len 160)

However when the jitter thing is going on, the debug is like this:

Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15837, ts 2535520, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29417, ts 474016904, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29418, ts 474017064, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29419, ts 474017224, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29420, ts 474017384, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29421, ts 474017544, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29422, ts 474017704, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29423, ts 474017864, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29424, ts 474018024, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29425, ts 474018184, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29426, ts 474018344, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29427, ts 474018504, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29428, ts 474018664, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29429, ts 474018824, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29430, ts 474018984, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29431, ts 474019144, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29432, ts 474019304, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29433, ts 474019464, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29434, ts 474019624, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29435, ts 474019784, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15840, ts 2536000, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29436, ts 474019944, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15841, ts 2536160, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29437, ts 474020104, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15842, ts 2536320, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29438, ts 474020264, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15843, ts 2536480, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29439, ts 474020424, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15844, ts 2536640, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29440, ts 474020584, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15845, ts 2536800, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29441, ts 474020744, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29442, ts 474020904, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29443, ts 474021064, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29444, ts 474021224, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29445, ts 474021384, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29446, ts 474021544, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29447, ts 474021704, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29448, ts 474021864, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29449, ts 474022024, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29450, ts 474022184, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29451, ts 474022344, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29452, ts 474022504, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15847, ts 2537120, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29453, ts 474022664, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29454, ts 474022824, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29455, ts 474022984, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29456, ts 474023144, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29457, ts 474023304, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29458, ts 474023464, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29459, ts 474023624, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15848, ts 2537280, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15849, ts 2537440, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29460, ts 474023784, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29461, ts 474023944, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29462, ts 474024104, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29463, ts 474024264, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29464, ts 474024424, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29465, ts 474024584, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29466, ts 474024744, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29467, ts 474024904, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29468, ts 474025064, len 160)
Sent RTP packet to AA.BB.CC.DD:16384 (type 8, seq 29469, ts 474025224, len 160)
Got RTP packet from AA.BB.CC.DD:16384 (type 8, seq 15850, ts 2537600, len 160)

The jitter problem is intermittent, so it can come and go during the
call. The duration of the jitter seems to be random; it can last from
1 - 30 seconds or less/more.

I'm not saying this necessarily is a CW issue, but it mysteriously timed
with the upgrade in August. Also, what's weird is that the clock on both
phones will sort of hang while the jitter occurs, which leads me to
believe there is some sort of resource exhaustion happening on the
phones.

Any ideas?

--
Vegard Svanberg <vegard@svanberg.no> [*Takapa@IRC (EFnet)]

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