Panasonic KX-MB2061CXB Service Manual page 195

12.3.13.3. Detective TAM Interface Section
1. The FAX turns on, but does not arrive through TAM.
CROSS REFERENCE:
TAM Interface Circuit (P.42)
2. A FAX is received, but won't switch from TAM to FAX.
CROSS REFERENCE:
Analog Section (P.193)
TAM Interface Circuit (P.42)
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KX-MB2061CXB/KX-MB2061CX2/KX-MB2062CXB