We started sending SMS to our opt-in clients today, and after sending about 5,000 or so messages, we are receiving the following error:
"Sending SMS from/to extension numbers is not available"
What is the issue?
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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