I Evaded the Call Surveillance on the Phone Network: Rob Braxman

source: https://www.youtube.com/@robbraxmantech/videos
Linphone: https://subscribe.linphone.org/login Still free sip provided
Linphone PC software: https://new.linphone.org/technical-corner/linphone?qt-technical_corner=2#qt-technical_corner

The Surveillance Nuts and Bolts of the Phone Network https://www.youtube.com/watch?v=o-1DXElkH2g
voip: https://www.youtube.com/watch?v=yuzrbvCtJek