Far site can see and hear me but I can't see or hear them
I have two Polycom units. An HDX 7000 and an older model. I can connect to Polycom test IPs just fine but when I try to connect with our sister company's Polycom it doesn't work. After making connection they can see and hear me but I can't see or hear them. They can connect to the Polycom test IPs as well without issue. I have an older Polycom unit at our main location and I can't connect to our sister company at all. I've verified the firewall ports a thousand times and they are correct.
Is there something I should be looking at specifically?