https://atscaleconference.com/calling-relay-infrastructure-at-whatsapp-scale/ https://atscaleconference.com/calling-relay-infrastructure-a... if i read this ri

https://atscaleconference.com/calling-relay-infrastructure-at-whatsapp-scale/ https://atscaleconference.com/calling-relay-infrastructure-a... if i read this right, whatsapp calls go thru relay servers?