Over the past 12 years, we've used Nagios to monitor our small ISP network and some hosted datacenter services. We have a single physical CentOS box (that's monitored via a separate cloud-based service) running the Nagios instance. Notifications are primarily sent via Slack webhooks via our production IP network, but we also have a Sierra Wireless 340U USB 4G dongle attached via USB to the Nagios host. This sends SMS to phones using Gammu, which is integrated with Nagios. Slack is the easy/convenient notification system, SMS is the "works when things are really bad" system. Since we're an ISP with our own AS and physical network facilities, I value the direct-to-SMS hardware attached straight to the monitoring host. The backing carrier is AT&T, which also provides our corporate wireless service, so these messages should theoretically never touch the Internet or have any transport outside of AT&T's network.
Problem is, the 340U hardware has begun to misbehave and require a reset every now and then. I'm not entirely sure whether it's bad hardware, a carrier firmware update, or something else. What is everyone else using for sending SMS out of band these days? I like the current architecture but don't really like this consumer-grade modem.
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