Is it time to use Transport Layer Security (TLS… essentially what we used to call “SSL”) to add a layer of trust and security to Voice-over-IP (VoIP) that uses the Session Initiation Protocol (SIP)?

Way back in June 2014, I gave a talk on this topic at the SIP Network Operators Conference (SIPNOC) in Herndon, Virginia. I recorded the audio of the session… but then lost track of the recording. I recently found it and, since much of it is (sadly) still relevant, I decided to release the recording as one of my The Dan York Report audio podcast episodes:

The slides that go with the presentation are available on SlideShare:

You’ll see in the slide deck that I also provide some tutorials around DANE and DNSSEC along the way.

Coincidentally, I learned on Facebook over the weekend that my friend Olle Johansson was speaking on this exact topic at the FOSDEM 2016 conference in Brussels this weekend. His slides about SIP & TLS are also available on SlideShare, and he has more recent information – and also the conclusion that we need to use “SIP Outbound” for any of this to work:

Olle’s last slide about what we need to do hits on the key points – and I agree with his conclusions.

Let’s look at how we can get more TLS used within SIP to bring about a more secure and trusted VoIP infrastructure!