[SR-Users] Bug in uac_replace_from if used more than once?

[Daniel Tryba]

Apparantly it should be simple to mangle the From in request:
http://kamailio.org/docs/modules/stable/modules_k/uac.html#id2525538

The task at hand is use the prefix 131 to suppress callerid for this call:

if($rU=~"^131[0-9]+$")
{
 strip(3);
 append_hf("Privacy: id\r\n");
 uac_replace_from("anonymous","sip:anonymous at anonymous.invalid:$rp");
 uac_replace_to("","sip:$rU@$rd");
}

Just before this replace there is an other uac_replace_from to rewrite an 
alphanumeric username to the default callerid for that device. If there are 2 
uac_replace_from in the path, things go wrong like below. A uac_restore_from() 
before the second uac_replace_from doesn't change this behavior.

device calls 1310123456789:

U 10.0.34.226:1300 -> 10.0.35.226:5060
INVITE sip:1310123456789 at kamailio.local:5060 SIP/2.0.
From: <sip:anonymous at 10.0.3.44:5060>;tag=26e5ce5850.
To: <sip:1310123456789 at kamailio.local:5060>.

Kamailio forwards request to dispatcher but fails to properly replace the from 
uri:

U 10.0.35.226:5060 -> 10.0.32.36:5060
INVITE sip:+31123456789 at kamailio.local:5060 SIP/2.0.
From: "anonymous" <sip:
+31987654321 at 10.0.3.44:5060sip:anonymous at anonymous.invalid:5060>;tag=26e5ce5850.
To: <sip:0123456789 at kamailio.local>.

Even though the debug log suggests it did the proper replacement:

uac [replace.c:265]: value to store is is '<sip:anonymous at 10.0.3.44:5060>' and 
len is '30'
uac [replace.c:268]: Storing in FROM-AVP (for use in reply): 
'<sip:anonymous at 10.0.3.44:5060>' with len '30'
uac [replace.c:324]: uri to replace [sip:anonymous at 10.0.3.44:5060]
uac [replace.c:325]: replacement uri is [sip:anonymous at anonymous.invalid:5060]
uac [replace.c:383]: encode 
is=<AAAAAAAAAAAAAAAAAABQXkFeV15BQUcUXF5AUWxpZDo1MDYw> len=48
uac [replace.c:265]: value to store is is 
'<sip:1310619024127 at kamailio.local:5060>' and len is '54'
uac [replace.c:271]: Storing in TO-AVP (for use in reply): 
'<sip:1310123456789 at kamailio.local:5060>' with len '54'
uac [replace.c:324]: uri to replace [sip:1310123456789 at kamailio.local:5060]
uac [replace.c:325]: replacement uri is [sip:0123456789 at kamailio.local]
uac [replace.c:383]: encode 
is=<AAAAAAEFAAkGAw0BAANxQlYuERJDCRxeHAoXWgYRXRdbAxtNHxwNCgdACxgubmw6NTA2MA--> 
len=72

Kamailio version: kamailio 3.3.2 (x86_64/linux)
(the latest stable debian/squeeze package).

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