Oswestry1407IT

I have recently inherited Google Voice. The school is having a large number of issues with call quality, especialy latency. The school uses a mixture of Handsets, Mobile phone ios/android apps and the PC application. The school has more than sufficant bandwidth and the network switches and WAPs are Cisco Meraki and Voice is hosted on its own VLAN. Full QOS policies are in place, but at random moments calls become very laggy. Has anyone experienced similar issues with Google Voice?