Panasonic KX-FP121NZ - Manual (Page 67)

Ring pattern when an extension telephone is connected
Receiving Faxes
The following message will
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TEL/FAX delayed ring count;
2 to 9 ring signals will be generated before the unit answers, depending on feature setting #78 on page 69.
In the TEL/FAX mode, the unit will not generate an audible ring during this time.
Silent fax recognition ring count:
The unit generates audible rings to indicate that it is receiving a voice call. 3 to 9 rings will be generated,
depending on feature setting #30 on page 69. This signal will not ring at an extension telephone.
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