If you're not seeing packetloss on your VPNs, then your ISP is causing the packetloss in your non-VPN testing.
Many ISPs will drop ICMP traffic when they're overloaded.
It's possible your VOIP problems are due to some other issue.
If you're not seeing packetloss on your VPNs, then your ISP is causing the packetloss in your non-VPN testing.
Many ISPs will drop ICMP traffic when they're overloaded.
It's possible your VOIP problems are due to some other issue.