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@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