Linux

What does that mean in practice? The only way to "not tolerate" abusive behaviour in this context is reactive - blacklist the number, report the incident to the police if it was so bad it might constitute a breach of the law, etc. But the effect on the working environment has already happened, employees will still be calling new numbers, and will still receive abuse. Similarly, in the example above, HR could have a policy to report comments people come across, but the same situation occurs: the effect on the working environment already happened, and there will be more bigoted comments out there.

It's not the employer's job to shield their employees from every possible abuse they might encounter when interacting with the public through phones, the internet or indeed real life. They do have a duty (depending on jurisdiction) to take reasonable steps to protect them from abuse, but do you not see how while it's reasonable to remove a customer saying bigoted stuff to someone working in a shop, it's not reasonable to disable effective internet access in a job where you need access to third party libraries?