Conclusions

VoIP is both feasible and increasingly being adopted as a substitute for fixed line telephony (and as the basis for mobile telephony).

SIP is more complex that it first seemed, but it is still approachable. Secure VoIP is possible, but like all security it takes effort.

There are lots of details, but there is also a lot of existing code, implementations, and documents.

Transcript

[slide549] So I think the conclusions are that VoIP's clearly feasible, right? It works. It's being increasingly adopted, even for fixed line. It's displacing traditional fixed line phones. It's now the basis for mobile telephony systems. It's a lot more complex than it first seems. If we look at the protocol, you wouldn't think it has all of these other issues. But secure VoIP is possible, but it takes some effort. There are lots of details, but there's lots of available open source code, lots of implementations, and lots of documents.