On 2023-08-02 11:57, Alvin Starr via talk wrote:

If you're worried about security, you might not want to do that. The cell phone calls are encrypted with IPSec, but those VoIP provides use plain SIP & RTP. At least that's what Fongo does.

That's why god invented SIP-TLS and SRTP.
Its a good thing that my VIOP povider supports this.

One one other thing they do is encapsulate the IPSec in UDP. This is to get through NAT, as IPSec is broken by it. It also provides seamless connection when moving between WiFi calling and the cell network.

Cell phone calls may be encrypted with IPSec but its not a match for moderately well equipped hackers.
Ask King Charles.

Were Chuck's calls intercepted? I know Diana's calls were, but they were analog back in those days and very easy to intercept. A heck of a lot of stuff uses IPSec and I haven't heard of it being broken.

Once your call hits the PSTN your open to snooping from any number of sources.

Plain PSTN is rapidly disappearing. Everything is moving to VoIP in some form. I have "POTS" from Rogers, but it's VoIP from the box that sits on my shelf. I have no idea whether they use encryption with it.