Try a different network
Mobile hotspots, home Wi-Fi, and guest networks often behave differently. A phone hotspot is the fastest test when a corporate or hotel network blocks the connection.

Calls are direct peer-to-peer. That means no relay servers by default — and some networks simply won't let two devices talk.
Mobile hotspots, home Wi-Fi, and guest networks often behave differently. A phone hotspot is the fastest test when a corporate or hotel network blocks the connection.
Some firewalls and symmetric NAT setups never allow a direct peer-to-peer link. We don't promise enterprise firewall traversal, and we don't run relay servers.
Even when the call connects, the quality you see depends on the camera, machine, network, and browser on each side. We don't warrant a specific resolution.
In a small mesh, a third participant on a reachable network can sometimes help the other two find a path. It is not guaranteed, but it is worth trying.