This notice is an update about the ongoing DDoS attacks impacting the telecom industry. Since September, there have been four known attacks targeting VoIP carriers. We want to keep you, our customers, informed and be transparent about the impact these attacks are having on Callifi.

Bad actors have been attacking about a dozen VoIP networks over the last few months. These sophisticated DDoS attacks average between 100gbps and 300gbps in size. And they are lasting from a few days to a few weeks. Consequently, all victims of these attacks have experienced downtime.
You may have heard about the week-long Bandwith outage in September.
Yesterday, a DDoS attack on our main under carrier lasted about two hours, and there was another attack last night that also lasted about two hours.
Our under carrier has been preparing for an event like this so they were able to mitigate these attacks to last only hours instead of days or weeks.
Callifi has a longstanding relationship with our under carrier and we are confident in their ability to mitigate the impact of these attacks.
We have been in constant contact with our reps and they are now migrating off their current DDoS/transport provider onto Cloudflare. This migration should be completed soon. However, they are unable to give an ETA as of now.
If you are interested in the technical details, here are two of Cloudflare’s blogs about these recent attacks:
We will be in touch if there is anything you need to do beyond communicating with your end users about this news. Rest assured, this downtime is unrelated to your equipment.
You do not need to worry. This this isn’t the first time our industry has been a target, and we are alive and well. While these telecom attacks are stressful, they are not profitable. As we know, the motivation for most bad actors is profits.
The Callifi Team is here for you, as always.
In the event you cannot reach our main number during the migration, we have an alternate number for you to call if your service is impacted: 1 (646) 868-6828.
Sincerely,