I know that in VMR there is a option where we are able to give a Passcode which is (optional). If someone didn't give passcode then Is Lifesize VMR is secure from unwanted guest user.
Each VMR has a unique extension that a caller must know to join. It is possible that someone could dial random numbers and connect just like they could with telephone numbers.
So it means that now lifesize will be think on Passcode which is now optional. I think it has to be mandatory by default . So no one can dial random numbers and not joining the VMR.
This works well as it is, so low level meeting can run with out a PIN and you can just enable it for meeting that need to be secure, this is easy to turn on and off so should be left as an option
Some customers prefer the convenience of calling without having to enter a passcode. Ultimately it is a balance of convenience and security and every organization is going to have their own requirements. The flexibility of an optional passcode addresses both.
Why Convenience Is the Enemy of Security | PCWorld
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