Webhooks come inbound

• Twilio's webhook introduction says Twilio uses webhooks to notify your web app when events such as incoming calls or SMS messages occur.
• It says the REST API handles requests from your app to Twilio, and webhooks handle the reverse, requests from Twilio to your app.
• The same docs area names signing webhooks with shared keys, and authentication with OAuth 2.0, Basic, or Digest.
• Bandwidth's messaging guide says a create call returns HTTP 202 Accepted, meaning the message is queued.
• Bandwidth says it retries a webhook for 24 hours until your server returns an HTTP 2xx, and then it stops.

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