[asterisk-bugs] [Asterisk 0013647]: unable to change sip from message from "Unknown" to anything else using set(callerid(num)=xxxx)

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13647 
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Reported By:                cooldeveloper
Assigned To:                
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Project:                    Asterisk
Issue ID:                   13647
Category:                   Functions/func_callerid
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.4.17 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             2008-10-08 10:26 CDT
Last Modified:              2008-10-08 10:49 CDT
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Summary:                    unable to change sip from message from "Unknown" to
anything else using set(callerid(num)=xxxx)
Description: 
When dialing in from PSTN (ZAP or MISDN channel) using a mobile with
blocked callerid, then does not matter wha I set int the dialplan using
set(callerid(num)=xxxx), the sip from header will be always "Unknown".
I transfer the PSTN call to a SIP extension using DIAL(SIP/XXXX,20,rto)
Whan I turn callerid sending on on the caller mobile, then the sip from
header will be whatever i set, eg. ivr, etc...
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---------------------------------------------------------------------- 
 (0093365) putnopvut (administrator) - 2008-10-08 10:49
 http://bugs.digium.com/view.php?id=13647#c93365 
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Assuming this is still present in 1.4.22, then I may know the line in
chan_sip.c which is causing this to occur:
<pre>
    /* if we are not sending RPID and user wants his callerid restricted
*/
    if (!ast_test_flag(&p->flags[0], SIP_SENDRPID) &&
        ((p->callingpres & AST_PRES_RESTRICTION) != AST_PRES_ALLOWED)) {
        l = CALLERID_UNKNOWN;
        n = l;
    }
</pre>

The 'n' and 'l' variables are later used in the function to populate the