What happens when PBX A calls PBX B in a bridged VPN?

When PBX A calls PBX B over a bridged VPN, audio is exchanged directly between the two PBXs. This configuration allows voice data to be transmitted directly over the same network, ensuring reduced latency and improved call quality. In a bridged VPN setup, both PBXs are effectively on the same local network, which facilitates direct media (audio) routing without having to pass through external servers or resources.

This direct exchange of audio between the two PBXs means that they can communicate more efficiently, which is a significant advantage in terms of both performance and quality of service during calls. In contrast, if audio were routed through PBX A or if there were no audio exchange occurring, the communication would be suboptimal and not leverage the benefits of the bridged VPN design.