I am getting messageStatus = "SendingFailed" and faxErrorCode = "RenderingFailed"getting while sending fax message, what can be the reason ?
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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