Take the private key and save it on your PC in a filename.key file. First you need the private key used by Kamailio. On VoipNow 3.5, you can find it in /etc/voipnow/certs/ kamailio.pem.Which means you have three choices: Capture the session key at the server side (only possible if you control the SSL termination point at YouTube) Capture the session key from the client (hard on a stock iOS. If the implementation is sound, youre not going to brute-force guess it. Otherwise, you won't be able to decrypt the capture. In order to decrypt SSL/TLS traffic, you need to get the key. Beside the filters, when you're capturing TLS, you need to make sure you capture the SSL handshake between the phone terminal and the VoipNow server.Under the option for ‘ (Pre)Master-Secret log file name’ - Browse to your log file location (so e.g. In the capture, t he encoded packets will appear as TLS. Open Wireshark, go to Edit > Preferences > Protocols > SSL. In the capture below, we had a call from phone terminal (A) 192.168.1.225 through the VoipNow server (B) at 10.150.20.27 and towards another phone terminal (C) on UDP at 192.168.3.152. As you can see, the part between A and B is missing because it's using TLS, whereas the communication between B and C occurs on UDP and is visible. Open Wireshark-tutorial-on-decrypting-HTTPS-SSL-TLS-traffic.pcap in Wireshark. When you open the capture, you'll see that the TLS part of the call is not even recognized by Wireshark as SIP.Some people call 'certificate' the union of the certificate and its private key, while some others (like me) say 'certificate.
Tcpdump -nni any -s 0 port 5050 or port 5060 or port 5061 -w /usr/local/voipnow/admin/htdocs/tls.pcap The server's certificate, sent as part of the initial steps of the SSL connection (the 'handshake'), only contains the public key (which is not sufficient to decrypt).
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