[sr-dev] [kamailio/kamailio] Sipt Redirection Number Retrieves old values (#2030)

[duarterocha91]

Greetings,

I'm doing VoiceMail detection using $sipt(redirection_number) from SIPT
module and i've been having some false positives on the detection.

I inspected further and noticed that in some cases
$sipt(redirection_number) returns old values from previous messages, which
makes me think that it's value is not being correctly refreshed. I'm using
this variable on a on_reply_route.

As far as i know, $sipt(redirection_number) is read only and can't be
refreshed by me in the code.

Here is an example :

Aug  7 16:51:49 dev_sbc_a_vts01
/usr/local/kamailio-5.2/sbin/kamailio[4746]: ERROR: <script>: VMD2 : Reply
Code : 180 ;  Sipt Redir = 9610050000 and Call ID =
00158FED-98B7-E911-8B3B-4DA50AE2ED72 at 192.168.24.86 and Cseq = 83

Here is the JSON from the 180 message : https://pastebin.com/zFHKxyav

As you can see, there isn't any 9610050000 in the message. What can be
causing this issue ?

Best Regards,

Duarte Rocha

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