The phone line that runs the business. FieldLine is the phone system for home-services operators — HVAC, plumbing, roofing, electrical, and the rest of the trades, based in USA. Provision dedicated numbers per technician and ad channel, forward to the phones your crew already carries, and every call comes back as a recording, full transcript, an AI summary, and a structured lead card. No softphone, no CRM to learn. Two-minute setup.