I tested with below rule and whats voice,video and that url does not work.
Here is screenshot of that rule.
Also the app whatsapp voice has below dependencies
rtcp, rtp-base, stun, whatsapp-base
So you need to block these also.
@MuhammadAbdeen I would be careful in blocking these other applications "rtcp, rtp-base, stun" especially RTCP and RTP-base. These are foundational to content presentation on the web. So be sure blocking these apps will not have any unintended consequences. (Make sure it's tied to the correct custom URL category, and intended user groups)
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