Analog telephone tech. spec

I have asked this question in detail in this thread:

[url]VOIP Phones (SIP) in Taipei? - #18 by X3M

I am concerned that is not the correct place for that question, so I summarize here.

To set up my VoIP adaptor, I need some technical specifications for standard analog telephones used here in Taiwan.

Please help me with the following:

FXS Impedance
Onhook Voltage
Polarity Reversal (YES/NO)

Thanks in advance for your great help! :notworthy: