Calls are not being transferred for about 12 hours now. We did not change or update anything with our assistant/phone/tools/etc. The AI states the call is being transferred and the call is immediately disconnected. We use Vapi as the provider/carrier.

That definitely sounds like a carrier-side transfer failure, especially if nothing changed on your end and the disconnect happens right after the AI announces the transfer. I’ve seen similar issues before with Vapi/Twilio transfer handling and SIP routing glitches, so there’s probably a specific point where the handoff is failing. Happy to take a closer look with you if you want to dig into it. @Dalton

Sure. Just odd that it's been working for months now, I guess.

Yeah, that’s what makes me think it’s less likely to be your setup and more likely something upstream that changed silently carrier routing, transfer permissions, SIP handling, or even a backend regression on Vapi’s side. When these break “out of nowhere” after months of stability, there’s usually a pretty specific trigger hiding in the logs. @Dalton

I am getting the same issue. I recall it working before but now it;s not working. The logs says it forwards the call and it was successful but in reality. I just get hanged up and our phone doesn;t ring with the live transfer number