Built a Missed Call Notification workflow that triggers the instant an inbound call goes unanswered. The automation immediately sends an SMS text-back to the caller, tags the contact as a missed-call lead, and creates or updates the corresponding opportunity in the pipeline. It then waits and checks whether the contact replies — routing 'replied' vs. 'not replied' down separate paths, with a follow-up retry sequence for anyone who doesn't respond right away — so no missed call ever goes cold without at least one recovery attempt."