VoLTE and SRTP

Tue Mar 8 21:58:55 UTC 2022

Hi, I was reading an article on why Russia hasn't taken out Ukraine's 
mobile networks and one of the premises was that they could use it to 
eavesdrop on calls. Depending on how old their infrastructure is, that 
doesn't make sense as I would assume that along with e2e SIP that they'd 
be using SRTP with the SRTP keys exchanged using DTLS which is my 
understanding of the way they are secured. My understanding could be 
wrong though, or either outdated, or not uniformly deployed.

The other thing that's weird is that the same article says they want to 
keep it up so they can use their bandwidth too which strikes me as sort 
of a crazy assumption in a war, but that's not much of an operational issue.

https://www.politico.com/news/2022/03/07/ukraine-phones-internet-still-work-00014487

Mike