In ringcentral what is the option we can block a number in our list of contact? Is any api available ?
Have you checked this link
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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