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+---
+aliases: fax-api, faxing, fax-server, efax
+display_name: Fax
+related: telephony, voip, sip, modem, ocr
+short_description: Fax sends a scanned page over a phone line or an IP network so the other end can print or store it.
+topic: fax
+wikipedia_url: https://en.wikipedia.org/wiki/Fax
+---
+Fax carries a scanned document between two machines over a telephone call, following the ITU-T T.30 protocol, or over an IP network with T.38. Banks, clinics, courts, and insurers still accept faxes, so developers keep writing fax servers, gateways, SDKs, and APIs that turn a PDF into pages, dial the number, and record whether every page arrived.