Fax over IP - FoIP
Fax over IP can be done in many ways, either realtime or store-and-forward
Realtime
- Transmission of a fax audio stream over a VoIP protocol, like SIP, IAX, H.323. This requires an uncompressed 64 kbit codec to have any chance of working, resulting in the need of around 80 kbit bandwidth. For a number of reasons it may or may not work even then.
- Fax over IP with a special protocol designed for this application. The key standardised protocol for this is T.38.
Store and forward
- A FAX, from a FAX machine, is decoded and stored by a FoIP gateway. It is then sent, using SMTP or a similar transport, to another FoIP gateway where it may be sent out to a destination FAX machine. The key standardised protocol for this is T.37.
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