Metering on the call record. A connected call is never zero minutes and any started minute is a whole minute, matching carrier behaviour. A forwarded inbound call is two billable legs at the carrier and is metered once, idempotently.
Also called: call charges · per minute billing · double billed for a call
- 1calls.metered_at is stamped after metering, and a retried status callback checks it first
- 2Whole minutes, rounded up, minimum one for a connected call
- 3The usage row is written with channel 'call' and unit kind 'call_minute'
Billing voice minutes at a text-message rate is the kind of mistake that never announces itself — it quietly overcharges some builders and undercharges others, and nobody finds it for months. Finished calls now meter exactly once, in whole rounded-up minutes, the way carriers bill them. The unit being billed has to be stated explicitly rather than defaulted, so it cannot silently fall back to the wrong rate, and a repeated callback from the provider cannot bill the same call twice.
- Double-billing from retried provider callbacks
- Voice minutes priced at the wrong rate
- Metering that disagrees with the carrier
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