Fax Class 2/2.0 operation requires the use of a fax-enabled application, that supports the +FCLASS=2 or +FCLASS=2.0 commands. The following table is an overview of Fax Class 2 and 2.0 commands.
| Class 2.0 Command | Class 2 command | Description |
|---|---|---|
| +FAA | +FAA | Adaptive answering |
| +FBO | +FBOR | Bit order |
| +FBS | n/a | Buffer size |
| +FBU | +FBUG | Report HDLC frame messages |
| +FCC | +FDCC | DCE capabilities |
| +FCQ | +FCQ | Copy quality |
| +FCR | +FCR | Capability to receive |
| +FCS | +FDCS | Current session parameters |
| +FCT | +FPHCTO | Phase C timeout |
| +FDR | +FDR | Receive phase C data |
| +FDT | +FDT | Transmit phase C data |
| +FEA | +FREL | Phase C EOL alignment |
| n/a | +FET | Page end |
| +FFC | n/a | Image data conversion |
| +FHS | +FAXERR | Hang-up status |
| +FIE | n/a | Procedure interrupts |
| +FIP | n/a | Initialize parameters |
| +FIS | +FDIS | Session parameter negotiation |
| +FKS | +FK | Session termination |
| +FLI | +FLID | Local station identification |
| +FLP | +FLPL | Document polling availability |
| +FMS | +FMINSP | Minimum phase C speed |
| +FNR | n/a | Negotiation reporting |
| +FNS | n/a | Non-standard negotiation |
| +FPI | +FCIG | Local station identification for polling |
| +FPR | n/a | FAX port rate |
| +FPS | +FPTS or +FPS | Page transfer |
| +FRQ | n/a | Receive quality threshold |
| +FRY | n/a | CTC retry |
| +FSP | +FSPL | Polling permitted |