You need to go through these: https://support.ringcentral.com/s/article/6072?language=en_US
As per following : "RingCentral are taking a step further and introducing the ability to make emergency calls using the same apps without writing any extra code. "
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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