I saw that in production environment, API username is main company phone number, and extension is default "101", can I change it to other extension(account) for API authentication?
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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