Hi Henk thanks for reply..
The voltage reading of SPA is 3.5V, FXO port impedance=600
SPA To PSTN Gain:0
PSTN To SPA Gain:0
Ringer Impedance:: High(normal)
The cables is ok...
The stranger is that both devices stop to receive PSTN, and aslo to get a PSTN line to call using that dial plan #9... maybe will reset it for factory default
any other idea...?
thanks...