It's a fair thing to want. Someone disruptive joins your call, and your first instinct is: can't I just block them?
The honest answer is that blocking individual callers in audio conferencing doesn't work as well as you'd hope, and can cause headaches of its own. Here's the reality, and what actually helps.
The Problem With Caller Blocking
Phone networks just don't give you much to work with before a call connects. Unlike email, where filters can screen content before it ever hits your inbox, providers mostly see routing and signaling data. There's no good way to vet intent ahead of time.
Caller ID makes this worse, not better. It can be spoofed, and anyone determined to disrupt a call can cycle through numbers faster than you can block them. Worse, if a block catches the wrong person, you've just locked a legitimate participant out of an important meeting.
That's the core issue: a feature that sounds useful but fails quietly, in ways that are hard to recover from. Vast Conference skips it in favor of tools that hold up in practice.
3 Features That Actually Give You Control
Web Interface: handle problems as they happen
When something goes wrong on a call, the web interface is where you go. It shows you a live list of everyone connected, who's in listen-only mode, and who is actively sending audio at any given moment. That last part is what makes it genuinely useful: instead of guessing where background noise or a disruptive caller is coming from, you can see it and act immediately. Mute them, remove them, done, without touching anyone else's connection.
It works better than blocking because you're dealing with what's in front of you, not a phone number someone may have already changed.
Lock Meeting: simplest fix once everyone's in
When your people are on the call and you're ready to start, just lock it. No one else gets in. It sounds almost too simple, but it's one of the most effective things you can do. Nuisance callers can't retry, unexpected dial-ins can't slip through, and you can focus on the meeting.
A quick roll call, then lock. That's really all there is to it.
Waiting Room: a smarter front door
Rather than trying to predict who shouldn't be on the call, the Waiting Room flips it around: nobody gets in until you say so. Someone dials in, they wait, you let them through. For bigger calls, external guests, or anything sensitive, that extra layer of control makes a real difference, especially in those first few minutes before things get going.
How to Use These Together
For anything sensitive or high-stakes: turn on the Waiting Room, let your expected people in, then lock the meeting once you're ready to start.
If noise is the main concern: keep the web interface open. You'll be able to see exactly who's broadcasting and mute the right line in seconds.
If someone's actively causing problems: remove them through the web interface. Everyone else stays connected, the meeting keeps moving.
Blocking callers by number feels intuitive, but in practice it's a patch on a problem that's bigger than one phone number. The web interface, Lock Meeting, and Waiting Room give you tools that work with how phone calls actually function, so you're not left scrambling when something goes sideways.