Meraki GR12 limiting Upload traffic

[CloudServYYC]

Over the last few days, we've seen both our Meraki GR12 APs rate limit WhatsApp and FaceTime video call upload traffic. We have disabled all QOS but still seem to be limited to 300Kbs. Traffic is RTCP and STUN on UDP port 3478. 

Does anybody have a resolution?

[speakerfritz]

What is your setup?

for example, meshed networks have a bandwidth cost penalty per hop.