Yeh I'm sure there's a way to get this done, but you're going to have to handle all of the SMS stuff yourself somehow. Meraki doesn't have any tools to help you, all they offer is Twilio. The ExCap config guide has some good info on what info goes back and forth, and what you need to send. It doesn't have any info on doing your own SMS ExCap specifically, but I would think it would have useful info to help you get it done. https://meraki.cisco.com/lib/pdf/meraki_whitepaper_captive_portal.pdf
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