Well this depends on how you're placing the call.. if its a standard bridge you can on the A-Leg set "effective_caller_id_number=000${caller_id_number}" before you call bridge.

Is the from already in the correct format?

/b

On Mar 5, 2009, at 6:12 AM, rod wrote:

Dear list,

I'd like to rewrite the number in the Remote Party ID header and only in 
this header.

ex: I'd like to prefix the caller  ID with a prefix code (000 in this 
example) in the  RPID header :

       From: Anonymous<sip:anonymous@anonymous.invalid>;tag=1208367
       Remote-Party-ID: 
<sip:123456@10.10.10.10:5062;user=phone>;privacy=full;screen=yes;party=calling

should become:
       From: Anonymous<sip:anonymous@anonymous.invalid>;tag=1208367
       Remote-Party-ID: 
<sip:000123456@10.10.10.10:5062;user=phone>;privacy=full;screen=yes;party=calling

But the From field should remain unchanged.

And how to strip this prefix:
       From: Anonymous<sip:anonymous@anonymous.invalid>;tag=1208367
       Remote-Party-ID: 
<sip:000123456@10.10.10.10:5062;user=phone>;privacy=full;screen=yes;party=calling

should become:
       From: Anonymous<sip:anonymous@anonymous.invalid>;tag=1208367
       Remote-Party-ID: 
<sip:123456@10.10.10.10:5062;user=phone>;privacy=full;screen=yes;party=calling


regards.