How long the messages will stored at RingCentral.
Inboud SMS
Fax
Voice..etc
See here: https://support.ringcentral.com/article/2178.html
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
https://support.ringcentral.com/s/article/2178?language=en_US
Check this - https://support.ringcentral.com/article/2178.html
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