In other words, what is the maximum number of messages that can be sent out in a limit before they get rejected by RingCentral?
RingCentral high volume SMS throughput is up to 3 msg per second. That makes about 250K messages per day.
There is no max number of messages for high volume SMS API. However, there is a max size of the /batches API payload to post a batch and that is 50MB. So the numbers of messages per API call will depend on the message length and the way you send the message (broadcast or personalized campaign)
Read these articles for more info about HV SMS.
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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