09-26-2010 05:25 PM - edited 03-16-2019 01:00 AM
Guys,
i have a vg224 that is servicing some modems for a customer that does financial transactions. im getting reports that the customer is having failed transactions intermittently.
the network is as follows:
CISCO 3800 with PRI terminated with h323 dial peers pointing to the vg224 with pots dial peers on the vg which in turn connects to the modems.
its working but intermittently so im not sure exactly where to start troubleshooting. we have tried to recreate the issue without success but before the vg was put into place the issue was not present.
does anyone have any similar setup that is working?
09-29-2010 12:15 PM
Get 'debug voip rtp sess name' from each side. You should see 192 NSEs sent and received on each side which is how we switch to modempass.
If anything fails, get 'sh call history voice br' after a failure from each side. Look for packet loss/latency, and make sure that the call shows it went into a MODEMPASS state.
09-29-2010 12:41 PM
just missed that debug. we did 20 transactions and all were sucessful.
for each i also noted the modempass on each occasion. there were two transactions that took a little longer than usual and i noticed that the FXS went off hook then on hook, went to another port then went back to the original port and completed the transaction. this still didnt give any comm error and the transaction went through fine (although it took a while).
My mistake is that i shouldnt have adjusted the dial-peer on the router to allow modempass before the testing. im hoping that this is the fix so ive asked them to monitor the backend and advise if they are seeing any duplicate transactions after today. Below is what i was collecting as a sample of the calls. What's the lost 3/0/0? Were those failed calls?
media inactive detected:n media contrl rcvd:n/a timestamp:n/a MODEMPASS nse bu
:0/0 loss 0% 0/0 last 0s dur:0/0s
18D4 : 8739 16435160ms.1 +760 pid:310 Originate 6703 active
dur 00:00:03 tx:207/32652 rx:204/32172
IP 10.80.32.20:16980 SRTP: off rtt:0ms pl:1945/5ms lost:3/0/0 delay:105/105/105
ms g711ulaw
media inactive detected:n media contrl rcvd:n/a timestamp:n/a MODEMPASS nse bu
f:0/0 loss 0% 0/0 last 0s dur:0/0s
09-29-2010 12:44 PM
That means you dropped 3 RTP packets in the 10.80.32.20--->[device the command was taken off of] direction. That could be enough to cause a modem transmission issue.
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