asterisk users - Jan 2005 - PSTN Pabx and asterisk

Good morning all,

I have a question: if I want to connect an * to a traditionnal PABX via 
TDM04B to get PSTN line (incoming and outcoming call), are FXO enough 
(no analog phones connected to *)? I just want to add PSTN call (in and 
out) possibility for SIP or IAX UA. From what I saw here 
http://www.voip-info.org/wiki-FXO I'm right.

Thanks.
-- 
Daniel