How long the messages will stored at RingCentral.
As per here, the RingCentral Retention Management APIallows Account administrators to customize the Data Retention Policy to ensure the organization keeps less than 90 days of message data
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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