FAX Commands in Data Mode

The FAX Class 2.0 parameter commands are valid while in data mode but do not affect modem behavior, except for the +FCLASS command, which will change the mode. All FAX Class 2.0 commands are valid in data mode except +FDR, +FDT, and +FKS which are valid only during FAX calls.

The only Class 1 command that is valid in data mode is +FCLASS.

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