Connection from Skype to Audiocodes not working after KB4540670, fixed by disabling VMQ

Hi, we have a Skype for Business installation and multiple Audiocodes Mediant 1000 gateways. Skype server is running on Windows Server 2016 on top of Hyper-V of Windows Server 2016. Host has Intel X520 NICs. VM has used VMQ, but not SR-IOV, for years without
any issues.

Yesterday we installed KB4540670 on both the Hyper-V hosts as well as the VM. Today around noon we suddenly received reports from all our locations that PSTN calls would not work. I found that Audiocodes logs were full of messages like this:

— SRTP Error - failed decrypting RTCP packet (PacketLength=191, PayloadLength=0): wrong SSRC (11) [Code:0x3700e] [CID:53]
SRTCP_SSRC_ERROR:1  [Code:0x5004] [CID:53]

And there were corresponding events in Skype log:

An attempt to route to a gateway failed. Could not route to Gateway xxxxx, the attempt failed with response code: 503 Service Unavailable 

Uninstalling KB4540670 from the VM or moving it to another Hyper-V host did not help anything. After reboot we probably could make one or two calls but then it stopped working.

Eventually I disabled VMQ for that VM, and everything started to work in that very instant.

Could there be a compatibility issue with either VMQ or the Intel drivers in KB4540670?

Read full post . . . .

Go Que Newsroom Categories

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 262144 bytes) in /home/content/36/8658336/html/goquecom/wp-includes/wp-db.php on line 1996