I am wondering if a fax is failed to deliver from the api call or remain undelivered for some reasons, what is the correct way of detecting a failed fax.
Where will I find the details of those fax sent
You will find in call logs. It will be message status as"Queued" which means the message hasn't been sent yet. If you see the status as "SendingFailed " then it means the sending is failed
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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