Telefax G4¶

G4 (Group 4) is a rarely-used version of the Telefax service which works only over ISDN. Contrary to the much more commonlty used G3 (Group 3) for analog telephone lines, G4 does not include any Modem. Instead, it natively uses digital transmission for the Telefax data over ISDN B-Channels.

B-channel captures¶

• raw B-channel capture of a G4 fax that manawyrm sent using RVS-FAX 3.0 on a Windows PC to the Canon_FAX-L260i of laforge on 2024-03-01
  • isdntap-manawyrm-00493065022141-2152-20240301-193039-1-tx.raw
  • isdntap-manawyrm-00493065022141-2152-20240301-193039-1-tx.raw