Help to set call forward always in asterisk

I am trying to set one of the fxs lines to call forward always to my cell phone in asterisk. in extensions.conf I set that extension to use “Macro stdRDNISexten”, I don’t know where to give my cell phone number as forwarding number. here is my extensions.conf

;Standard extension macro
; ${ARG1} - Extension (we could have used $MACRO_EXTEN} here as well
; ${ARG2} - Device(s) to ring
exten => s,1,Set(origcpn=${ARG1}) ; Check if user extension has CFA always activated.
exten => s,n,DBget(temp=CFIM/${ARG1})
exten => s,1,Set(temp=${DB(CFIM/${ARG1})})
exten => s,n,GotoIf(${temp}?cfim:nocfim)
exten => s,n(cfim),Dial(Local/${temp}@outboundcfwd/n)
exten => s,n(cfim),Goto(outboundcfwd,s,1)
exten => s,n(nocfim),NoOp

exten => s,n,Dial(${ARG2},20,r) ; Ring the interface, 20 seconds maximum
exten => s,n,Goto(s-${DIALSTATUS},1) ; Jump based on status (NOANSWER,BUSY,CHANUNAVAIL,CONGESTION,ANSWER)

;exten => s-BUSY,1,Voicemail(b${ARG1}) ; If busy, send to voicemail w/ busy announce
exten => s-BUSY,1,Hangup() ; Used to return User Busy over PRI & convert to 486 by IAD
exten => s-BUSY,2,Goto(default,s,1) ; If they press #, return to start

exten => _s-.,1,Goto(s-NOANSWER,1) ; Treat anything else as no answer

exten => a,1,VoicemailMain(${ARG1}) ; If they press *, send the user into VoicemailMain

;used for incoming calls to any number served by pbx
exten => 0372,1, Macro(stdexten,0372,${LINE1})
exten => 0373,1, Macro(stdRDNISexten,8225550373,${LINE2})
exten => 0374,1, Macro(stdexten,0374,${LINE3})

exten => s,1,SetCallerPres(allowed)
exten => s,2,Set(CALLERID(rdnis)=${origcpn})
exten => s,3,Dial(Zap/g3/${temp})