Talking about VOIP & VPN specifically, there is a lot more info to this than this article says, can't discuss here but VOIP and VPN are heavily monitored.lthe issue is UDP packets are getting interrupted
in VOIP and Online Games
To monitor and curbing “grey traffic” — which includes Voice over Internet Protocol and Virtual Private Networks — the PTA has deployed a sophisticated web monitoring system.
The equipment, which is worth $18.5m, is provided by Canada-based company Sandvine. The web monitoring system will use Deep Packet Inspection (DPI) to monitor communications, measure and record traffic on behalf of the PTA.
“This system will facilitate in the identification and eradication of grey traffic causing huge loss to the national exchequer, and internet content management as mandated under Clause 37 of Prevention of Electronic Crimes Act, 2016,” the authority said in a press release in October last year.