asterisk users - Mar 2014 - modify from field sip headers

Hello,

Im trying to modify the 'From' field in my sip headers in order to
include
extra info (user=tel) as it follows:
>From :"" <sip:005114824403 at 200.91.0.146;user =tel>
However asterisk is still doing this header:

"11111111" <sip:11111111111 at 1.1.1.1>;tag=as167b4b82

Is there a way to accomplish this? Ive been also looking up AGI but without
any success. Ideas are welcome!

Kind regards
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> Im trying to modify the 'From' field in my sip headers in order to
> include extra info (user=tel) as it follows:
The default extensions.conf has this, it might help.

;-------------------------------------------------------------------------------
; from-pstn-to-did
;
; The context is designed for providers who send the DID in the TO: SIP 
header
; only. The format of this header is:
;
; To: <sip:2125551212 at 172.31.74.25>
;
; So the DID must be extracted between the sip: and the @, which this does
;
[from-pstn-toheader]
exten => _.,1,Goto(from-pstn,${CUT(CUT(SIP_HEADER(To),@,1),:,2)},1)
;-------------------------------------------------------------------------------