Distorted audio, HDLC Abort, Bad FCS under high load

HI,
Please comment echocanceller in system.conf.
If possible,could you send your SSH to my email:[email protected]?
I'll check it for you.
And you can add my MSN/G-talk:[email protected] to contact with me.

We can now replicate the issue using identical hardware and software config in our development environment, simulating call volume by looping test calls between two of the interfaces. This produces approximately 20 HDLC error messages in a 330 call test.

Have commented out the echocanceller line for the interface, and the test still produces these error messages.

However we have another live system which does not produces these errors. The key difference we can see so far is that the servers producing the error are IBM x3650 M2 79473AG, while the one that works is an older IBM x3650 7979B1A. I am now trying to see if these servers handle interrupts or PCI hardware differently.

HI,
It should be hardware compatibility issue with IBM x3650 M2.

Hi,
Please check if the interrupts and dahdi_test result are normal.
If possible, would you please exchange the cards on the two servers?

could you try to swap to our new model D430P? whichi we are sure would not have such issue.

dahdi_test result is normal (worst result 99.98%)

Interrupts look good to me, using APIC.

Have now updated the UEFI firmware for this server and still get the same HDLC errors on loopback testing.

Afraid I can not exchange cards between servers, the one where it is working OK is a live production server.

Would you have any idea why there might be a hardware compatibility issue with the IBM x3650 M2 servers? Is there anything further we could do to mitigate these effects?