SHOW CREATE TABLE pbx.callcenter;
And post the output here inside [code] tags.
What does your disk setup look like?
As far as I can figure out from your files you only have 2 disks connected connected to the MR9260-4i controller.
The question is if you have a battery backed up cache on the disk controller used for write back?
The reason I'm asking is explained in point 3.
Because if you don't have a battery backed up cache on the RAID controller then changing this:
which will probably give you a huge difference.
With this set to 1 without a cache you will only be able to insert/update/delete about 100-150 queries per second.
The drawback with setting it to 2 is that if the server dies from power failure you can't be sure that you don't loose a query. But the performance benefit is usually worth it.
And related to the one above you should change these settings also:
to something like:
But changing the innodb log files is a bit tricky so read the last _two_ paragraphs on this page:
And then you have some settings here that are just ridiculously large:
Which I would set to something like:
Because these settings are _per_session_ and not global settings. And making them much larger than that is usually not beneficial.
Let me know how it works out