Building a voice agent on Vapi that does outbound calls to patients for appointment confirmations. Works great for what we need. The issue: patients sometimes call back the number, and I don't want to build a full inbound agent in V1 that can pull appointment details and match them to the right patient. That's way too much scope creep for our timeline. Ideally we only do outbound calls right now. Long-term obviously we'll make it bidirectional, but we need to ship fast and keep scope tight. How have others handled this scenario?