Just a quick update:
At launch we had a soft limit of about 8 tabs going on per scammer given some constraints that we had related to voice transcoding. We've eliminated the need for any live transcoding of audio and that work is now pushed to your browser and mobile device.
BobRTC devs are happy to report that our call carrying capacity has recently GREATLY multiplied (we can't reveal by how much because scammers read this). Next week we are starting work on expanding our EU datacenter!
The new soft limit is 16 calls per number.
If you are in the middle of a RAID (Really Annoy Indian Dialers) with a team, these soft limits do not apply and you should launch as many tabs as you can, given that you're participating in a RAID with a team and the whole point of a RAID is rapid search-and-destroy. If you're in a RAID with other people you should probably change the topic of the IRC chat room that you are in (bottom of the screen) by using the /topic command so anyone who shows up in the channel knows that the number is being RAIDed.
If you just want to test your Ryzen threadripper to the max and run way more tabs than this, then you need to pick a variety of numbers to hit rather than focusing on just a single number.