Ok I think I'am Close,
I found the sendfax -n -d NNNNNNNNN doc.pdf command.
and I think this should work
add this to /etc/asterisk/extensions_custom.conf
;# [FaxBack]
exten => 329,5,Answer
exten => 329,10,Wait(1)
exten => 329,15,agi(googletts.agi,"Welcome to the Fax Station:. Please enter your 10 digit fax number.",en)
exten => 329,20,Read(NUMBER,beep,10)
exten => 329,25,agi(googletts.agi,"Choose number 1: For your Ryan's Resume:.Please enter the Resume number to retrieve.",en)
exten => 329,30,Read(DOC,beep,1)
exten => 329,35,agi(googletts.agi,"To fax document number ${DOC} to fax number: ",en)
exten => 329,40,SayDigits(${NUMBER},)
exten => 329,45,agi(googletts.agi,"Press 1 now. or 2 Cancel",en)
exten => 329,50,Read(FAXOK,beep,1)
exten => 329,55,GotoIf($["foo${FAXOK}" = "foo1"]?70)
exten => 329,60,agi(googletts.agi,"Your Fax has been cancelled.",en)
exten => 329,65,Goto(80)
exten => 329,70,System(/usr/bin/sendfax -n -d ${NUMBER} /root/faxes/${DOC}.pdf)
exten => 329,75,agi(googletts.agi,"Your Resume number ${DOC} is now being sent.",en)
exten => 329,80,agi(googletts.agi,"Mahalo. Good bye.",en)
exten => 329,85,Hangup
;#[END FaxBack]
But google is down for what ever and can't test it right now it's late here on Maui
Any help would be great
oh just name you pdf files 1,2,3 ect. and place them in /root/fax/ or change line 70 to what ever folder you like just make sure you name the like 1.pdf or 2.pdf ECT.