Call
The one channel that actually wakes someone up
A real phone call via Twilio, the alert spoken inline the moment it connects -- reserved for what actually deserves to page someone.
- A Business-plan channel, same as SMS, and the most intrusive one by design
- The alert is spoken inline in the same request that places the call, not fetched from a webhook mid-call
- No link read aloud -- there's nothing useful about reciting a URL over the phone
Spoken inline, not fetched mid-call
Most Twilio call integrations point at a URL Twilio fetches once the call connects, for instructions on what to say. This skips that entirely: the spoken message is generated up front and handed to Twilio as inline Twiml in the same request that places the call, so there's no extra public endpoint standing by just to answer "what do I say right now."
Reserve it for a trigger you actually want someone paged for -- a spike rule on a payments path is the obvious fit, not a routine new-issue notice on a low-traffic internal tool. It's the most disruptive channel here on purpose.
Reserve Call for triggers that genuinely warrant paging someone.