Whitelist PhoneIQ's Global Network:
51.81.54.16/29
51.81.54.24/32
51.81.107.25/32
216.185.146.184/29139.178.87.120/29
145.40.121.216/30
In conjunction with PhoneIQ's global IP network, if you need to get more specific, then you will need to (at a minimum) open the following UDP ports for registration and phone calls to function:
SIP Signalling Ports: UDP 5060 & 11000
WebRTC Ports: UDP 5065
STUN: 7000
RTP Audio Port Range: UDP 16384-32768
Device Provisioning: HTTP 9090, HTTPS 443