4.Set S51.2=1 to enable DTMF tone detection. It is reported as RING. If the remote fax machine does not generate the CNG tone, ask a fax caller through your answering machine message to press “*” (or any other DTMF key) if he or she wants to send a fax.

Save the settings in a profile and reset the modem with AT&WZ.

Special Functions 51

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ZyXEL Communications U-336R/RE manual Special Functions