[SR-Users] $Au being set to $fu instead of $fU

[Joel Serrano]

Hi,

Testing on latest master deb nightly build from last night I've noticed
that when $au is not available, $Au is being set to $fu (uri) instead of
$fU (username).

Docs: https://www.kamailio.org/wiki/cookbooks/devel/pseudovariables

...
$Au - Acc username: username for accounting purposes. It's a selective
pseudo variable (inherited from acc module). It returns auth username ($au)
if exists or From username ($fU) otherwise.
...

I have the following log in several places in a test box:

xlog("L_NOTICE", "[DEBUG] Au=$Au au=$au aU=$aU fU=$fU fu=$fu - \n");

And when I run through them (on both request and reply routes) I get the
following:

Aug  8 14:37:43 csbc01 csbc[9478]: NOTICE: {1 21564 REGISTER
d8df9be1-1702e20b at A.B.C.D} <script>: [DEBUG] Au=1002366 at some.domain
au=<null> aU=<null> fU=1002366 fu=sip:1002366 at some.domain -

Aug  8 14:37:43 csbc01 csbc[9479]: NOTICE: {1 21565 REGISTER
d8df9be1-1702e20b at A.B.C.D} <script>: [DEBUG] Au=1002366 at some.domain
au=1002366 aU=1002366 fU=1002366 fu=sip:1002366 at some.domain -

Aug  8 14:37:43 csbc01 csbc[9484]: NOTICE: {2 21565 REGISTER
d8df9be1-1702e20b at A.B.C.D} <script>: [DEBUG] Au=1002366 at some.domain au=<null>
aU=<null> fU=1002366 fu=sip:1002366 at some.domain -

Those 3 logs belong to the same flow from different places in the config
script.

I would expect $Au to never have a "@some.domain" in it, so I assume in
some place the replacement is not being done with $fU but with $fu.

@Devs: I'm happy to create a GH issue for tracking etc if required, please
let me know!

Cheers,
Joel.
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