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[binni at binni.eu]

Hello all

Over the last couple of months we’ve been experiencing a strange problem, which I’ve been unable to solve.

We have an Asterisk 1.4.19 that’s been running happily for the last several years. All calls go through an AGI server from dialplan.

On average we have appr. 3000 incoming calls/day. All calls go in via the AGI server, various sound files and menus are played, and every single call ends up in a queue.

Every now and then, when one of our SIP customer answers a call from his/her queue, the call is connected but hangs up in 6 seconds (seems surprisingly constant). Both ends of the call can hear each other for a second or two (not as many as 6 seconds) before the call hangs up.

The frequency of this happening is difficult establish precisely, we have some 40 customers, and they don’t always tell me when this happens. The worst I have heard of is this morning, where one of our customers experienced 1 in 4 calls having this problem. Last week the frequency for this customer was more in the region of 1 in 50.

In all cases the second attempt seems to succeed, i.e. the originating caller tries again and gets through “properly” the second time.

I have not been able to find anything in the log files for Asterisk or the AGI server. I’ve not run a SIP trace, as this would be a major undertaking with our traffic and the sporadic nature of the problem – but if all else fails, I’ll try that!

At one point I thought it might be a problem with RTP channels and tried setting them to default values, but that has not had any effect. The sound goes through fine in both directions, but only for a couple of seconds.

I hope someone here will be able to help me!

Thanks in advance.

Binni

[nachum.yaron at gmail.com]

Hello Binni,It is hard to say anything without more information.
You need to understand what happens in those dropped calls.


Logs would help. Traces might help also. Try mirror the traffic to another server and capture it using tcpdump, or even run tcpdump on the server itself.






On Tue, Dec 16, 2014 at 3:05 PM, Brynjólfur Þorvarðsson <binni@binni.eu (binni@binni.eu)> wrote: