Pinpoint Voice Quota Clarification

Hello,

I'm attempting to use pinpoint to mass send out voice messages to parents of a school district, but I'm finding the quotas confusing. If there a limit of a max of 20 calls per minute, even with a production account (ie: non-sandbox)?

This page makes it sound like the 20 calls is a limit of sandbox accounts: https://docs.aws.amazon.com/pinpoint/latest/userguide/channels-voice-sandbox.html

but this page make it look like that is a limit on production accounts: https://docs.aws.amazon.com/pinpoint/latest/developerguide/quotas.html#quotas-voice (but it also states you can send 1 call per minute, but only for the first 20 seconds, as there is a max of 20 per minute then right?)

To me, 20 calls/minute seems very restrictive for an AWS product doesn't it? Is pinpoint the wrong tool for the job if I want an application to mass send (I was thinking like a few hundred a minute via lambda) automated TTS calls to our students?