We’ve been using Freepbx for a while and have recently introduced a new conference number.
Unfortunately external callers are saying that they can’t hear internal callers as its too choppy.
When I do a iax2 show netstats I get a lot of packet loss and jitter.
Channel RTT Jit Del Lost % Drop OOO Kpkts Jit Del Lost %
IAX2/dynint-194 1000 27 83 11 1 0 0 0 0 0 0 0
When I call into a standard extension there’s no loss or jitter.
I’ve seen some mention of jitter buffer not being enabled on meetme, and am unsure if this is the solution to my problem and if so how I enable it. Hope someone can help.
I don’t know if the jitter buffer is having an affect on normal call traffic, I just know that when using the conference number we get packet loss and jitter.
I guess i could try disabling the buffer and see if anyone notices any difference.
We have very little utilisation on our phones, this was the only call in progress. I called in from my mobile and could see immediate lost and jitter counters going up.
Are you running in a virtual environment? But as you see the clock is mis-timing in this example by about 10% run it with a higher count. or at the same time as you are in conference to see if the mios-times are coincidental.
Its a physical server. Tried running with count of 20 but similar results. Not sure where you’re getting 10% from, looks like less than 0.02% fluctuation.
8192 samples in 8191.297 system clock sample intervals (99.991%)
8192 samples in 8182.480 system clock sample intervals (99.884%)
8192 samples in 8191.040 system clock sample intervals (99.988%)
8192 samples in 8222.944 system clock sample intervals (100.378%)
8192 samples in 8190.960 system clock sample intervals (99.987%)
8192 samples in 8190.953 system clock sample intervals (99.987%)
8192 samples in 8190.937 system clock sample intervals (99.987%)
8192 samples in 8190.960 system clock sample intervals (99.987%)
8192 samples in 8190.928 system clock sample intervals (99.987%)
8192 samples in 8167.024 system clock sample intervals (99.695%)
8192 samples in 8190.992 system clock sample intervals (99.988%)
8192 samples in 8190.952 system clock sample intervals (99.987%)
8192 samples in 8190.983 system clock sample intervals (99.988%)
8192 samples in 8190.944 system clock sample intervals (99.987%)
8192 samples in 8223.088 system clock sample intervals (100.379%)
8192 samples in 8190.952 system clock sample intervals (99.987%)
8192 samples in 8191.000 system clock sample intervals (99.988%)
8192 samples in 8183.000 system clock sample intervals (99.890%)
8192 samples in 8190.944 system clock sample intervals (99.987%)
8192 samples in 8191.064 system clock sample intervals (99.989%)
— Results after 20 passes —
Best: 99.991 – Worst: 99.621 – Average: 99.926377, Difference: 100.002101
any one second sample of 8192 that is much less than 99.98 (or more than 100 ) will likely expose a noticible audio defect in the audio stream, as I suggest see if those measurements coincide with poor audio on the conference, (run it without the count argument)