asterisk users - Feb 2006 - test of FXO and FXS in TDM400P

Hy,

I would want to "test" the FXO and FXS channels of a TDM400p with the 
asterisk. For example, when I want to Know if a sip peers is correctly 
register, I use ChanisAvail, but if a module FXS hasn't a phone 
connected, How  could I Know it?.
Note, that I don't want to Know if the channel ZAP is correctly 
configurated. This information is given for Chanisavail.

Thanks for all.