![]() 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.Otherwise, you won't be able to decrypt the capture. Some estimates have 2. Wireshark is an open-source network analysis and packet sniffing software created by a collaboration of a very vast community of developers. open Help -> About Wireshark window switch to Plugins tab select codec as Filter by type To play the RTP audio stream of one or multiple calls from the VoIP List, select them from the list and then press the 'Player' button: Choose an initial value for the jitter buffer and then press the 'Decode button'. Flow Sequence and Play Streams are shown below, and they provide a quick overview of what happened with the call. 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. We will be using Wireshark and using it to identify and resolve issues occurring on our PBX or VoIP Softswitch platform. 1- Identify all calls in the capture Go to Telephony > VoIP Calls and select the desired call. ![]() In the capture, t he encoded packets will appear as TLS. 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. When you open the capture, you'll see that the TLS part of the call is not even recognized by Wireshark as SIP.Tcpdump -nni any -s 0 port 5050 or port 5060 or port 5061 -w /usr/local/voipnow/admin/htdocs/tls.pcap
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