Intermittent One Way Audio, AT&T Support Says Due To High Jitter, Not sure how to fix

[Stewart1 (Stewart)]

@jdennis

The tricky part is going to be to do the capture while the intermittent issue is happening. Going to try that today.

I recommend starting with a packet capture on the PBX into a ring of files. You can let it run 24/7 and when trouble is reported, you should have enough time to find a file demonstrating the problem, before it gets overwritten. See

Best method to troubleshoot call quality

It should not be hard to see (from Asterisk’s point of view) what is going wrong, though it may not be easy to fix. As root, start a tcpdump capture of everything on the server, using a command like tcpdump -s 0 -C 100 -W 100 -w rbuf -Z root & This writes a circular buffer of 100 files (rbuf00, rbuf01, … rbuf99), each 100 MB long. Be sure that you have 10 GB of extra disk space available. If there are ~100 active call legs @ ~ 80 kbps * 2 each, you’ll have ~1.4 hours of historical data. When …