Does the ADMIN have to logon first to enable something or can you share the link /app with an end usee to enable for their own extention? Does it send out from their number where up to 250K people could respond or does it send from a number that can't be replied from?
To configure High volume SMS it should be A2P numbers (Application to person). You need A2PSMS permission in app.
check this : https://community.ringcentral.com/questions/91975/how-to-enable-a2psms-permission.html
Can you please check following links to start with:
https://support.ringcentral.com/article/High-Volume-SMS-Overview.html
https://developers.ringcentral.com/guide/messaging/sms/high-volume
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