Hi — I found guidance suggesting that inbound webhooks may not work properly on Twilio SIP trunk imported numbers. That appears to match our issue exactly. Our setup: - Twilio number - connected to Retell via Twilio SIP trunk / imported number flow - outbound calls work - inbound callback detection logic works in our backend - inbound webhook responds correctly with callback-aware values - but the live inbound callback call still does not use the correct inbound callback opener What I need confirmed: 1. Do inbound webhooks fully work on Twilio SIP trunk imported numbers? 2. If not, is this a known limitation? 3. If it is a limitation, what is the recommended supported workaround for missed-call callback routing on imported Twilio SIP numbers? 4. Should we instead use SIP headers / another inbound configuration method for callback state? 5. If inbound webhook overrides are unsupported on this number type, is buying/using a Retell-native number the only reliable way to get this behavior? If helpful, I can provide: - webhook payload - webhook response - example transcript - exact call behavior - screenshots from CRM and Retell