Incoming call status callback

Payload sent by SignalWire to your Inbound Call Status Callback URL for inbound calls to a phone number. Configure `StatusCallback` at the phone number level via the dashboard (**Phone Numbers** → select a number → **Phone Number Settings**) or programmatically via the [create](/docs/compatibility-api/rest/incoming-phone-numbers/create-incoming-phone-number) or [update](/docs/compatibility-api/rest/incoming-phone-numbers/update-incoming-phone-number) Incoming Phone Number API endpoints. By default, the webhook fires only when the call is `completed` or `failed`, making it well-suited for tracking inbound call success rate, call quality, and total call volume in a call center context.