[SR-Users] Kamailio 4.3 decrypting SIP-TLS

Remsik,Robert Robert.Remsik at colostate.edu
Tue Feb 20 21:31:19 CET 2018

Cool, I will check that out.  Thank you.  :)

Robert Remsik


Desk Phone: 970 491 7120

Robert.Remsik at colostate.edu

From: Daniel-Constantin Mierla <miconda at gmail.com>
Sent: Tuesday, February 20, 2018 1:16:59 AM
To: Kamailio (SER) - Users Mailing List; Remsik,Robert
Subject: Re: [SR-Users] Kamailio 4.3 decrypting SIP-TLS


for Kamailio v4.3 you can print is syslog the $mb as it was suggested in the other response (https://lists.kamailio.org/pipermail/sr-users/2018-February/100378.html), you can do that in request_route or onreply_route. In onsend_route you can print $snd(buf).

Then there is siptrace module that can work standalone and store sip traffic in a database table.

If you have a production system with lot of traffic, Homer Sipcapture project might be something to consider -- kamailio has the modules siptrace and sipcapture.

I also want to highlight that v5.1 has a new module sipdump that should simplify the capture of sip traffic:

  * https://www.kamailio.org/docs/modules/stable/modules/sipdump.html

I added it because I needed to look at tls traffic while developing/debugging.


On 16.02.18 21:28, Remsik,Robert wrote:


I'm working on setting up our kamailio instance to use TLS for inter-phone communication and so far I've been able to configure the GUI and get it to work which is great.  However, I'm trying to grab a packet capture and decode the TLS session to get the SIP ladder (so I can troubleshoot issues) and so far I've been unable to.  I've been following the article at: http://packetpushers.net/using-wireshark-to-decode-ssltls-packets/ and using the kamailio self-signed cert as I think that's the cert being used with no success.  I'm getting the Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA (0x0035) which doesn't use perfect forward secrecy so it should be able to be decoded.

Is there a way to decode the kamailio TLS encoded communications so I can troubleshoot issues that may come up?

Thank you in advance,

Robert Remsik


Desk Phone: 970 491 7120

Robert.Remsik at colostate.edu<mailto:Robert.Remsik at colostate.edu>

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