Analouge phone 4 SIP calls

Hello guys, this is my first post so forgive me if this has been asked and answered. Can someone tell let me whether it is possible to make a SIP outbound call from an analogue phone connected to the FXS Modules of my TDM400P Digium card? Or I need a voip phone?
Of course I am running Asterisk (v1.2.4).
Thanks for your reaction.

Yes as long as you have a connection with a voip provider

heres is how mine works
local goes out pstn and Long distance goes to my voip termination via IAX

exten => _NXXXXXX,1,SetCallerID(<1111111111>)
exten => _NXXXXXX,2,Dial(Zap/G1/${EXTEN})
exten => _NXXNXXXXXX,1,SetCallerID(“my name” < 1111111111>)
exten => _NXXNXXXXXX,2,Dial(IAX2/provider/${EXTEN})