Beginning: 13.01.2022 – 3.22 PM
Ending: 13.01.2022 – 3.40 PM
Impact: Call disturbances
Dear customer, dear partner,
On 13.01.22 at 3.17 PM, our voice network handled a huge and unexpected amount of outbound calls which were providing from several sources, generating several thousands of CAPS (Call Attempt Per Second).
Despite our security mechanism immediately triggered, the behavior kept going on for long, which started to impact our Voice servers at 3.22 PM.
Source of unexpected calls were immediately discovered by our engineers, and were temporarily banned. Situation went back to normal at 3.40 PM.
In order to prevent this from happening in the future, our team improved the above-mentioned mechanism by limiting the number of CAPS per IP address by 100 every 5 seconds, after what the IP address will be temporarily banned.
Best regards
SEWAN Technical Team
