How can we block a particular number we want?
Check this:
https://forums.developers.ringcentral.com/questions/8932/can-we-block-a-contact-number.html
https://support.ringcentral.com/s/article/7251?language=en_US
Super Admin can block a number applied to all extensions
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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